actually the belief in God should not effect how you see "sin"
in essence sinning is doing wrong, its just giving it a new name.

if i don't believe in sin it doesn't meant i don't believe that killing people is wrong, i just don't give "wrongs" the name sin.

if you don't believe "sin" is bad then your probably a sociopath or along those lines because if you believe the world is millions of years old bad choices were here before it was given the name sin.

at least thats how i see "sin" pertaining to believing in God.

to answer the other question of what do you believe in.

why must i have a belief in anything other than myself?
IMHO I believe that there is a God but I don't have to get down on my hands an knees to be a believer.

God will not judge me for my actions or my sins, he will judge me for my person an for what I hold true to me.

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