This is why Atheists think Christians are a joke
How about the theory of evolution of Charles Darwin, is that true? We came from apes? since you are justifying your own thought scientifically and mentally, did someone proved it? then give some proof who created the universe, because I believe God created the whole universe. If you will answer about theories specifically big bang theory, since it is a "theory" still no one proved it and it will still remain a theory.
Tons of evidence for both. We are closely related to the same ancestor as chimpanzees. We share 98+% of DNA with chimpanzees.
Evolution
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https://en.wikipedia.org/wiki/Homo#Hominina - start here to get basic terminology
https://myweb.rollins.edu/jsiry/Rich'd_Dawkins-Evidence_Evolution.htm
http://www.scientificamerican.com/article/15-answers-to-creationist/
http://humanorigins.si.edu/evidence
http://evolutionfaq.com/articles/five-proofs-evolution
Big bang
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http://www.universetoday.com/106498/what-is-the-evidence-for-the-big-bang/
http://www.schoolsobservatory.org.uk/astro/cosmos/bb_evid
http://science.nasa.gov/astrophysics/focus-areas/what-powered-the-big-bang/
There is a great book on history of humans, I strongly recommend it to anyone who is interested in how we shaped our history, why we have (had) religions, how societies were formed and structured. It takes you from pre-stone age times all the way to present. Amazing story of human experience.
http://www.amazon.com/Sapiens-Humankind-Yuval-Noah-Harari/dp/0062316095/ref=sr_1_1?ie=UTF8&qid=1455857411&sr=8-1&keywords=A+brief+history+of+human
I can guarantee you, you'll look at the world, your country, your religion, your nationality in a completely different way.
Read the reviews on amazon if you don't believe me.
There is also a good documentary on PBS:
https://www.youtube.com/watch?v=2E6K49qvmSk