Sacrifices

Did the Creator command his children to make bloody sacrifices and burnt offerings? There are many scripture verses that lead me to believe the answer is no.
Could these practices be pagan religious rites the Hebrews adopted during their Egyptian captivity ?

Archaeologists uncovered a vase from the ancient city of Urak, which is believed to be the second city built by Nimrod (listed in Genesis 10:10). The vase pictures the early religious rites performed by  worshippers of the Goddess Inanna.
It is quite apparent from the carvings that the offerings being made to Inanna are the same ones that Moses (or was it Jethro the Midianite High Priest) gave to the Hebrews - 1700 years LATER! 
There are meal (grain), fruit, and vegetable offerings. A water libation. The High Priest of Inanna is pictured offering the "first fruits" (sound familiar?)
There is also a precession of meat offerings in the form of ewes and lambs.

So the question arises, did Yahuah copy the worship of Innana, and have the Hebrews direct it toward him?

I think it's unlikely (to say the least).
This is what the scriptures say:

Thus says , the of Israel: "Add your burnt offerings to your sacrifices and eat meat.
 "For I did not speak to your fathers, or command them in the day that I brought them out of the land of Egypt, concerning burnt offerings or sacrifices.
 "But this is what I commanded them, saying, 'Obey My voice, and I will be your , and you shall be My people. And walk in all the ways that I have commanded you, that it may be well with you.'
 "Yet they did not obey or incline their ear, but followed the counsels and the dictates of their evil hearts, and went backward and not forward.
 "Since the day that your fathers came out of the land of Egypt until this day, I have even sent to you all My servants the prophets, daily rising up early and sending them.
 "Yet they did not obey Me or incline their ear, but stiffened their neck. They did worse than their fathers.
Jer 7:21-26 (NKJ)

Sacrifice and offering You did not desire; my ears You have opened; burnt offering and sin offering You did not require.
Ps 40:6 (NKJ)

, open my lips, and my mouth shall show forth Your praise.
For You do not desire sacrifice, or else I would give it; you do not delight in burnt offering.
The sacrifices of , are a broken spirit, a broken and a contrite heart-- these, , You will not despise.
Ps 51:15-17 (NKJ)

I have no need of a bull from your stall or of goats from your pens,
 for every animal of the forest is mine, and the cattle on a thousand hills.
 I know every bird in the mountains, and the creatures of the field are mine.
 If I were hungry I would not tell you, for the world is mine, and all that is in it.
 Do I eat the flesh of bulls or drink the blood of goats?
 Sacrifice thank offerings to , fulfill your vows to the Most High,
 and call upon me in the day of trouble; I will deliver you, and you will honor me."
Ps 50:9-15 (NIV)

"To what purpose is the multitude of your sacrifices to Me?" Says . "I have had enough of burnt offerings of rams and the fat of fed cattle. I do not delight in the blood of bulls, or of lambs or goats.
 "When you come to appear before Me, who has required this from your hand, to trample My courts?
 Bring no more futile sacrifices; incense is an abomination to Me. The New Moons, the Sabbaths, and the calling of assemblies-- I cannot endure iniquity and the sacred meeting.
 Your New Moons and your appointed feasts my soul hates; they are a trouble to Me, I am weary of bearing them.
 When you spread out your hands, I will hide My eyes from you; even though you make many prayers, I will not hear. Your hands are full of blood.
 "Wash yourselves, make yourselves clean; put away the evil of your doings from before My eyes. Cease to do evil,
 Learn to do good; seek justice, rebuke the oppressor; defend the fatherless, plead for the widow.
 "Come now, and let us reason together," says , "Though your sins are like scarlet, they shall be as white as snow; though they are red like crimson, they shall be as wool.
Isa 1:11-18 (NKJ)

I will also cause all her mirth to cease, her feast days, her New Moons, her Sabbaths-- all her appointed feasts.
Hosea 2:11 (NKJ)

"I hate, I despise your feast days, and I do not savor your sacred assemblies.
Amos 5:21 (NKJ)

With what shall I come before , and bow myself before ? Shall I come before Him with burnt offerings, with calves a year old?
Will  be pleased with thousands of rams, ten thousand rivers of oil? Shall I give my firstborn for my transgression, the fruit of my body for the sin of my soul?
He has shown you, O man, what is good; and what does  require of you but
to do justly, to love mercy, and to walk humbly with your ?
Micah 6:6-8 (NKJ)

Thus says  : "Heaven is My throne, and earth is My footstool. Where is the house that you will build Me? And where is the place of My rest?
 For all those things My hand has made, and all those things exist," says  . "But on this one will I look: on him who is poor and of a contrite spirit, and who trembles at My word.
 "He who kills a bull is as if he slays a man; he who sacrifices a lamb, as if he breaks a dog's neck; he who offers a grain offering, as if he offers swine's blood; he who burns incense, as if he blesses an idol. Just as they have chosen their own ways, and their soul delights in their abominations,
 So will I choose their delusions, and bring their fears on them; because, when I called, no one answered, when I spoke they did not hear; but they did evil before My eyes, and chose that in which I do not delight."
Isa 66:1-4 (NKJ)

Is a bloody sacrifice needed to be righteous before ?

And it shall be our righteousness, if we observe to do all these commandments before , as he hath commanded us.
Deut 6:25 (KJV)

"The soul who sins shall die. The son shall not bear the guilt of the father, nor the father bear the guilt of the son. The righteousness of the righteous shall be upon himself, and the wickedness of the wicked shall be upon himself.
 "But if a wicked man turns from all his sins which he has committed, keeps all My statutes, and does what is lawful and right, he shall surely live; he shall not die.
 "None of the transgressions which he has committed shall be remembered against him; because of the righteousness which he has done, he shall live.
Ezek 18:20-22 (NKJ)

It seems from the scripture verses shown above that the creator, , has the right to forgive sin, and he has set his criteria. 

Another interesting view of the reason behind the sacrifices is taken from 2Kings, chapter 23. This book details the depravity into which Yahudah had fallen, worshipping idols, practicing temple prostitution and the homosexual rites of Ba'al worship.
It is written that King Josiah desecrated the place called "Topheth," (meaning drums). Drums which were beaten loudly to drown out the screams of children being burned to death in sacrificial rites. King Josiah forbade witchcraft, sorcery, idolatry, the drunken orgiastic fertility festivals that took place, and human sacrifices. Some believe that these practices were so entrenched in the habits and mindset of the people; they were too difficult to overcome. So the priests replaced human sacrifice with animal sacrifice, and the fertility festivals became a celebration of showing gratitude to .

It is written of hamashiyach:

Therefore, when He came into the world, He said: "Sacrifice and offering You did not desire, but a body You have prepared for Me.
In burnt offerings and sacrifices for sin you had no pleasure.
Then I said, 'Behold, I have come-- in the volume of the book it is written of Me-- to do Your will, O  .' "
Previously saying, "Sacrifice and offering, burnt offerings, and offerings for sin You did not desire, nor had pleasure in them" (which are offered according to the law),
then He said, "Behold, I have come to do Your will, O ." He takes away the first that He may establish the second.
Heb 10:5-9 (NKJ)

Hamashiyach said, "....a body you have prepared for me." 

Therein is the key to understanding the reason for mashiyach's sacrifice. Adam had an immortal body that he turned into a mortal body. Adam's mortality separated him from .It was Adam who left the presence of . 
In order to gain our way back into YHWH's presence, hamashiyach offered a body without sin, which was made subject to death. This was in opposition to YHWH's law "that only the soul of the sinner shall die."
Yhwh was compelled by this law to resurrect HaMashiyach, for in him, no sin was found.
Read more on this topic in t

2) If you could explain your idea of mortal sin and imputed sin and how that worked with the sacrifices.

If you don’t understand the relationship between sin and the body of sin, Mashiyach sacrifice has a different meaning. Is it a bloody beating and a death that made Yahuah happy?

he book, "A Beautiful Delusion."

Read more about the Vase of Urak at "The New Moon."

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