DNA Proves Existence of a Designer

[I_am_not_mafia]

Why did he give humans free will if it meant that they would end up decaying over time  and dieing?

It was His will not to force them to love and obey Him.  He gave them that choice.  They fell but He had a plan to redeem them through Jesus Christ; the Lord.

OK to summarise, your god designed everything, including perfect immortal humans to love and obey him. But he decided that he wanted them to love him out of their own free will and not because they were forced to (sounds like an abusive relationship)

So Adam and Eve were somehow designed to have free will and make their own decisions. But to achieve that he needed to put something in their environment that he could forbid them from doing. This was an apple that would redesign Adam and Eve to decay over time and to die. But if they did that then many thousands of years later their descendents (but not all) would be able to be redeemed by Jesus Christ.

I have to say that if your god wrote this up as a scientific paper that I was reviewing that I'd have to reject it on the grounds that the outcome was inevitable.

Given the freedom to perform a range of actions then the probability of performing all of them tends towards 1 over time.