And that’s what atheists do. They’re skeptical to all supernatural beliefs across the board.
Yes, and it is fruitful as it would be questioning whether one should actually have belief instead of unbelief.
“Belief” isn’t a single thing, it is a disparate group of often mutually-contradictory things. So it doesn’t make sense to ask “should I believe?” without first specifying what it is you are actually contemplating believing in. So we look at each belief individually.
Atheists are outsiders to all religion. Therefore it is not illogical that we assign a similar probability to each religion’s supernatural claims that any other outsider does.
You are an outsider to Islam. You assigned a zero probability to Muhammad splitting the Moon (and would likely do so to other Muslim supernatural claims that are not also Christian supernatural claims). Therefore it is not unreasonable that an atheist would also assign zero probability.
A Muslim is an outsider to Christianity. That Muslim would likely assign a zero probability to Christ’s ressurection. Therefore it is not unreasonable that an atheist would also assign zero probability.
And so on.
You should have the same level of skepticism about your lack of belief as I have about my belief.
I have just explained why this doesn’t make sense. Your simply restating your claim without engaging that argument is straight out of Monty Python – “the automatic gainsaying of anything the other person says” – from The Argument Sketch: