And that is the problem, DOC. You are at a sceptics board. You have been here long enough to know that the person who makes a claim shoulders the burden of proof. That is how this game is played.
What you have really done is make a claim which is in the form "Most atheists do not know that science says all the galaxies come from something smaller than a pea". That is a claim which is quite easy to evidence, and Mashuna has pointed that out in a very witty post - witty and profoundly relevant. Other bits of evidence have been kindly provided by other posters ( even though they have no need to provide it, since the claim is yours). Thus Seismosaurus has explained this is taught in schools; and most of the atheists in this thread ( an admittedly small and self- selecting sample) have explained they do know it. So the evidence we do have is against you and it is now up to you to do the work: make a survey or find a survey which asks the question. There is nothing to prevent you doing this, and although it would be time consuming, and you might have to learn a fair bit about designing such studies, even a flawed bit of research would give us something to discuss. It is clear from the time you have spent on these two threads that you do have the time (nothwithstanding your busy life).
But you did not do this. Not about big bang and not about abiogenesis. In this thread you avoided the issue by posing your statement as a question. This has not fooled anyone. Arthwollipot has stated it most clearly but everyone else has recognised your ploy to some extent and has called it implicitly or explicitly.
You have now made it plain that you do not accept the affirmative answer and you are not interested in the evidence which supports that affirmative answer. Nor are you interested in research which would challenge that answer.
This is not about physics. I have already said I do not have the background to understand the physics, and I think randfan has admitted as much too. But it is clear there are those here who do have that understanding and they have spent their time and effort to help you to get it as well. You are not interested. That effort is not wasted because once again I have learned a little and I am sure many others have too. But you have not
While the physics is hard, and, as Hokulele has pointed out, the layman's usual mode of approach to new problems does not serve us very well in these fields ( visualisation and analogy tend to break down as tools in this area, for example); market research is a lot simpler and you have no excuse for not getting the basic idea in that field.
I suggest you accept the rules of the game, DOC. Go and find some evidence in support of your claim, then come back to us. I will be interested in the results, as I have said. I think others will as well. If you find that people do know this, and it does not affect their atheism, you will have learned something about the diversity of people. That is genuinely interesting if you happen to have that cast of mind. If your survey is sophisticated enough you might be able to test your second hypothesis (that this will make a difference to atheists' beliefs) too: or you can make a second bit of research to look at that one. There is a lot of scope here. Why not do something about it, instead of hanging on to your opinion in face of what evidence we do have. You might even enjoy it!