"why you dont believe in God. "
Same reason why we don't believe in leprechauns and Zeus and Ra; lack of evidence.
"Even science that is proven correct that will
prove creationisim wrong."
a) creationism was never proven right and is not science
b) see also: evolution
Show me the people who kill or discriminate against people for the tooth fairy, or try to argue we should base our laws on tooth fairy belief, or try to get toothfairyism taught in biology classes and I'll be all over them like a cheap suit.