Big bang is wrong because it can't be proven and God can be proven because people hear him in there heads.
http://en.wikipedia.org/wiki/Cult_(religious_practice)
God himself if almighty got the basic biological and astrological teaching wrong. For example, in Islam it is said that shooting stars aren't small meteoroids but missiles shooting down demons who are trying to see what God is saying by climbing up the outer walls of Heaven. It is also said in the Qur'an that semen is created in the rib cage, this is complete bullstuff.
Addon: It also states that below the Earth is a deep pool of mud the sun sets in, that states that the sun revolves around Earth. Ripping 15 years of my life spent on nothing.
The Universe is expanding, that means billions of years ago it had a beginning. Even in holy text stated that in the beginning there was darkness, and then light came as God separated both of them.
I stopped being Christian after my God received an F through his own work.
If religion never existed, the dark ages never would of come. The Renaissance would of come much earlier, and the moon landing would of come much earlier than the 20th century.