God is a controversial topic for some people.  I believe we can do nothing without God!  He is my inspiration! 
that is a great way to see it but you also have to consider humanism and the use of freethinking
God gave us freedom of choice.  Do you not agree?
I agree but the free thought is often by the hand of rejection of participants of the dogma
After Jesus died on the cross we are forgiven for our sins. His suffering provided for us to be forgiven. Though we should not go around doing bad things all the time.  But if we do and are truly sorry God will forgive you.
so he will forgive us no matter what we did what happen if some sins are bigger than others?
Man kind made one sin worse than another.  In God's eyes all sin is sin.  So yes he will but I believe the key is remorse.  You cannot go around sinning without later feeling it was wrong.  That is difference between good and evil.
then showing remorse will be like going to a confessional with other human that is also do sin? or it just a 1 and 1 with God
I don't believe in confessionals with a priest. I am not Catholic.  I was actually raised Catholic but as an adult I disagree with them. This communication is always 1 on 1 with God.