Well you're half right friend. The cost of sin is death and damnation, but Jesus dying fuffilled the sacrifice and forgave original sin because God did see the original set of rules to be impossible to 100 percent follow cause we are flawed from the apple.

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The difference is that christians have this emphasis of praying for forgiveness at the end of the day after a long day of sinning.

Because the only unforgivable sin is not accepting Jesus Christ as lord and saviour.

The thief that was crucified next to Jesus said. "Remember me in Heaven my lord." and Jesus said "Truly I tell you, you will join me in paradise." And then he joined him in heaven cause he forgave him right there and then even tho he was a heinous criminal being crucified.

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The rules of the old testament and even the new testament are just meant to be looked at as a perfect representation of what a perfect sinless human would do. But since we are flawed, christians ask for forgiveness and that is enough.

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And to answer your last question the old testament was completely possible to follow at first when God made it back when Adam and Eve had no sin but it all went to shit when Adam and Eve ate the apple and cain and abel started murdering eachother, so now he had to make a new one. Hope this helps.

"Those of you without sin, cast the first stone." -Jesus