I can't show you statistics, though its possible that surveys exist.I can probably agree with that atheist don't believe in the BB, because it favours God. But can you show me where atheists don't believe in the theory of evolution (not just questioning)?
The fact is, a lot of people, regardless of their religious beliefs, don't know much about evolution, or care much about it. For most people, science isn't a big concern in their lives, so they don't have firm beliefs about things like the big bang or evolution. So, while some might not be violently opposed to the theory of evolution, they might still not have any kind of well-formed belief in that theory.
Having said that, the whole idea that anybody needs to believe in scientific theories in the same way that one believes in the supernatural is a misguided one. Scientific truth rests on objective evidence for or against, not on subjective belief in it.
Here's one example, perhaps: Scientologists are atheists, in that they don't believe in gods. A scientologist might well believe that humans have souls ("thetans") that reside in our bodies due to the volcanic explosions created by the alien warlord Xenu, or however the dogma goes. So, the Scientologist doesn't believe that human beings in our present forms arose solely by natural evolution.
As you know, it varies among individuals.Is the ''probably'' fixed. Or does it vary amongst individuals?
Because it is common for theists - yourself being one repeat offender - to claim that atheists declare that it is certain that there are no gods (or no God, if you prefer). In fact, very few atheists are that absolute about it. What they tend to say, if they've thought about it, is that there's no convincing evidence for anything supernatural.Why include it at all?