If you don't believe in creationism, then you don't believe jesus died for you. True?

I would disagree. You can believe that Jesus dies for the sins and know that the earth is over 6000 years old. If you believe in God and the big bang it is not hard to put those two together if you are a person of faith. There is nothing to stop a person of faith from saying that god did not use the big bang to create the world. The concepts of creation and evolution and the big bang do not have to be on opposing sides if you are a person of faith.