Is it all right not to believe in the bible?

I'm 13 and come from a christian family. We aren't EXTREMELY christian. But we go to church every few weeks. Now, I don't believe in the bible. I mean, we came from asteroids; god didn't wave his hand and create all life. I have some reeaally crazy theories, like "God" was an advanced alien, and that the Egyptians flew over to South America on a hot air balloon (more of that in my next question). My parents yelled at me when I said that I didn't believe in the bible. Is this right of them?