Where did the universe come from? Atheistic origin science has no answer.

[Brakeman]

the error the atheist make is a presuppositional belief that the future- discovery-gap will explain things; if the supernatural is ruled out before the investigation, that's a belief not an argument. ..

You may not know this, but real scientists let the evidence do the talking. If a chemist puts two new chemicals together, he isn't sitting aside, writing lists of outcomes he will accept or not accept. No, you must be confusing science with theistic apology. If Richard Dawkins himself dissected a new form of life and a little green magic ghost demon popped out, he'd describe it to his best detail, as he is only interested in reality. It is theists that have ulterior motives.

How would a "presuppositional belief," as you imagine, even work? Do you think a fossil hunter would throw his newest discovery in the trash because it doesn't support his pre-concieved lineage ideas? No, in reality he would buy everyone beers because he's found something new and even more challenging.
Give us a real world example of how your idea of "presuppositional belief" bias would work. I think you are just grasping at straws. - Desperately..