Atheism is irrational.

[Neo-Scholastic]

I could argue that fairies exist.  I could develop some clever arguments to "prove" my point.  What I couldn't do is provide actual evidence because fairies don't exist, so all I would have would be arguments. 

I'd love to hear them Some demonstrations are better than others. I prefer those that take as given the universe's intelligibility and the efficacy of human reason.

To the OP, no, it is not "irrational" to not believe that magic is real. 

Define 'magic'. I probably don't believe in that either.

And your argument, like most of these shit arguments, slyly tries to shift reality, just a little, away from the fact that "I DO NOT ACCEPT that God is real" and toward the fantasy that "I DENY that God is real."  To not accept something is simply to assert that there is not enough evidence to convince you, which is atheism.  To deny something is to assert that there is enough evidence to prove it wrong.  It is a shitty way of lowering the bar for yourself while simultaneously raising it for us.

Your post reeks of incredulity.