There have been a long list of definitive proofs for the last couple decades now.
Anyhow science and christian religion don't contradict on this.
There are no proofs on big bang theory. There are theories of theories upon theories. Think of it this way. We believe there is a 95% chance this might happen given these conditions which are 60% chance to occur and given these conditions there are 85% chance and etc... This is a cumulative and dependant statistical proposition. Many writer will just say 95% and forget about the 60% and the 85%...given this is cumulative the real chance of such an occurences of the said wwill be .95*.60*.85 = .48 or said, 48%. Now just imagine if the statistics weren't just three and let's say 100s or 1000s of conditions... What are the chances of all these dependant activities occuring? It's VERY low. There are no proof...just ideas; just like religon.
Lots of people and top world Physicists don't agree with the big bang theory so let's here your alternate theory on how the Universe came to be. All religious theories are welcomed
The current two competing major ideas are that focus on the infinite universe and the finite universe. The infinite universe contradicts law of conservation of energy (meaning energy is never created or detroyed and it is constant in the universe). If the infinite universe is true then somehow if I figure it out, I should be able to draw energy from thin air. Anyone watch the HULK? He can draw ambient energy from the air, thus when he needs it, the air around him becomes frozen because the hulk takes all of the kinetic energy (heat) from the air molecues. The finite theory suggests that all energy started with a point and that this point has everything.
Now there are even more complicated theory based upon the ever expanding universe. Some say the universe will expand forever and this is for the infinite energy theory group...Some say it can't. It has to contract. Thus came the birth of the expanding and contracting universe which falls inline with the finite energy theory group.
To sum it up. If you believe the universe has infinite energy then you should fall in line with the infinite expansion theory. If you believe in a constant energy by the laws of conservation of energy then your best bet is the contracting and detracting theory. Both theories have their own fault...of the BIG questions.
In summary, all scientist believe that the big bang occur...the method or how is debated with no evidence...it's a philosophical exercise until someone can determine a new equation such as the unifying theory of all theories as postulated by the greats like Einstein.
Here's a thought (notice I said thought, not theory).
What if God created the Universe by creating the Big bang? eh? eh?
If God didn't create it, who did?
Who is to say it is not God? Given the curent belief if you are a string theory follower that there exists 11 dimension. I can't make heads or tail of all those dimensions.