I don't think it is contradictory at all when put in proper context. IMO
You mean when we engage in intellectual dishonesty and make believe?
Why would we ever do that?
Why would you expect us to take that as a valid intellectual answer?
If you do not believe, then I'm OK with that. It's your decision.
Knowledge isn't a choice, either sufficient evidence and reason exists to accept a proposition as true or it doesn't. I can no more 'choose' to believe the bible or the christian god then I can walk out my front door and 'choose' to believe my death trap of a sub compact is a magical dragon ready to fly me to work.
That would be delusional, why are you reducing the ability to 'know' to a qualification that openly invites delusion?
What would be the purpose of that
When did you ever establish there was a purpose?
. And if everything was creating in a big bang
False dichotomy, the big bang has nothing to do with atheism. If I discovered a god to exist tomorrow, it wouldn't invalidate the big bang. The big bang, like every field of scientific research just invalidates religious mythology making it impossible for the christian god to exist for example.
then where did these gases come from and what was there before that...
The cooling and expansion of the singularity. Energy is matter and the conservation of energy remains constant, so effectively if the total sum of energy in the universe is 0 then nothing has really changed. We both come from and go into 'nothing'. This isn't the philosophical absence of everything, nothing doesn't actually exist.
? what is the source for all of these things...? And what makes them react the way that they do...? And somehow someway we appear. Why...? What happened....
Emergent properties, thermodynamic self organization, evolution. All of these things easily answer your questions.
These are question that people can only answer for themselves. Science hasn't nor can it prove theses things.
Actually, it can answer many of them, you're just trying to make up questions for the unknown that don't exist. Also, as I pointed out before, it is a false dichotomy and has nothing to do with atheism. You've specifically set yourself up to be against intellectualism and attack the foundations of the ability to 'know' anything, because you don't want to be faced with the emotional conflict that your religious myth ( christianity ) is false. So you try to reduce the ability to know to a point where you can't know anything. It is intellectually dishonest on your part and morally unconscionable that you would ever project it upon others.