If you believe in evolution, then you believe in the Big Bang.
Not necessarily, and for the record, it's not so much a question of belief as it is a question of examining the evidence.
The Big Bang was so stupid that it actually caught on to people who felt threatened by the truth and had to hide behind a stupid theory such as that.
What truth is threatening? God? Scientists don't feel threatened by God. If you want to talk about being threatened by the truth and making up some stupid alternative theory just to hide from it, examine fundie attitudes to climate change and then we'll talk.
It the Big Bang really happened, where did the energy come from to cause a "bang"? Why did it explode? Is there even a reason?
The fact that it was not a literal explosion aside, no-one really knows, but scientists are working on solutions. The most recent suggestion is that quantum tunneling caused the Big Bang, but whether or not that's actually the case is not yet known.
Did you know that the name "Big Bang" was christened by a scientist that found the theory so stupid that he was mocking it?
I did indeed. That's like me calling a computer a 'magic lightning box' and then you claiming it therefore can't work.
Evidently the other scientists, having no other way to explain the theory, took it up.
'Evidently' being the operative word. They took it up because it was 'evident', i.e. there was evidence in support of it.