None of them can by any means redeem his brother, Nor give to God a ransom for him—For the redemption of their souls is costly, And it shall cease forever—That he should continue to live eternally, And not see the Pit. . . . But God will redeem my soul from the power of the grave, For He shall receive me. Selah - Psalm 49:7-9,15
http://www.biblegateway.com/passage/?search=Psalm49:7-9,15&version=NKJV
I can provide more to backup what I'm saying, if necessary.
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If Jesus is not God, and is instead just a created Being made for only one purpose, then His life is not valuable enough to pay for the life of even one man, let alone every man since creation.
Oatsy, what's the most valuable thing in existence? God, right? What is the price of sin? Eternal death, right?
Death is separation. When a man dies, his spirit is separated from his body, and either is transported to heaven or hell, and his body begins to decay. This is called physical death.
Spiritual death is when that man's spirit is separated from God.
God said in Genesis to Adam, the day you [sin] you shall surely die. And they did die, even though they lived for another 900 years or so. They were separated from God the very day that they sinned, cast out of the Garden.
No created being has existed for eternity past, like God has. He had infinite worth already at the moment He created, and if the next half of eternity is similar to the first half, He will have infinitely more worth.
Created beings have a beginning, so even though they will exist forever, and have infinite worth, they will never be as valuable as God.
So if the punishment for just one man's sin is an eternal punishment, and no man can ransom himself for another, and only God is of infinitely more worth than man, ergo only God is valuable enough to pay for man's sin, and not just one man's, but every man's sin, because He is FAR more than valuable enough to pay the debt owed.
Therefore, if Jesus is a created being, only a man, and even though He lived a perfect life, His sacrifice is not valuable enough to pay for anyone other than Himself.