You say you don't believe anything and almost immediately follow it up by saying you believe something.
Did you mean to say you don't have faith in anything at the beginning?
Put it this way. Gone are the days where it's assumed everyone believes Jesus was the son of God. In fact you should know out if ten people maybe 2-5 believe Jesus was literally the son of God.
Some people believe in generic God. I went from Christian to theist to an agnostic atheist. I really truly don't believe there is a creator in the conventional sense. Logic tells me man made it up.
But my position can only matter if you believe in the Christian God. If all you believe in is a generic creator and you understand religions are made up, then it doesn't matter if I believe. And then what makes you think a heaven exists?
And no Christian that truly believes should ever get mad. They should only feel sorry for non believers