The fuck are you on about? Adam and Eve were already expelled from Eden when they had children, who in turn were born into sin.
I do believe though, that the covenant Christ forms with us through his sacrifice essentially wipes the majority of old testament rules/sins(like premarital sex) off the board.
Your point is irrelevant, they were already sinners.
What did Christ say one needed to do to get into heaven?
If you can point the passage out to me, where Jesus tells us we need to marry before having sex, or not eat meat on sundays, or any of the other old testament rules, please do.
Otherwise, I will continue to live my life in accordance with Christ's words as best I can understand them.