I'm with you that the Big Bang would have been unthinkably hot. But being that hot, why wouldn't everything simply be gaseous?
I was thinking of that also. If everything became a gas, then in the vibration fields caused by the alleged bang, substances would have grouped together by kind, and we would just have blobs of this, and blobs of that. No mixing.
The big bang also assumes evolution, but evolution obviously is impossible, since there is no evidence for it. And please don't say 'the finch of the beak'.
I also have to ask, what would have caused a disc? Is gravity working in a specific direction rather than between any massive particle? Is another force at work?
I don't believe in the big bang, so I don't need to explain how a disk formed out of the bang. But I suppose two things might have smashed together? If I really had to believe in the big bang, I might think of it that way.