Just because you don't believe in God, it doesn't mean you are exempted from his requirements.

God requires perfection in our living. So how come I feel safe when I've been an adulteress. God is also a loving God and he has provided a way for all who believe to come to him through Jesus, the only perfect human, who was also God. If we put our trust in him our sins are wiped away and God accepts us as his own children and welcomes us into his kingdom, no matter how bad we've been. So there is hope for you.