Absolutely. It could be used in the same way as homophobia (not necessarily a clinical phobia but at least aversion or prejudice against).

[theconversation.com]

It's the whole realization that their world view is false. Religious people's fear of atheists is fueled by the thought, that if there is no god, then there is so much they might have given up or will give up, to believe in an after life. They fear that death is just the end of life, sure. But, I think that in some instances they have given up some secret desires, because their religion doesn't allow for it.

You answered your own question.

Besides, if it were real it would be a-theo-phobia to give the correct Greek components!

A phobia, I believe not being a clinical psychologist, is an anxiety disorder that seriously affects an individual both physically and mentally, on many occasions to the point where they are unable to function due to fear, frequently accompanied by panic attacks. Phobia is a real and terrifying condition. It is not, as the suffix usually indicates, an aversion to a contradictory philosophy. I would suggest that the term athephobia has been created as a rhetoric device to undermine atheistic thinking. If it exists as a clinical condition, I would like to know the number of diagnosed cases and their demographic distribution.

People can fear pretty much anything and any ideology. I don't think the word "athephobia" is formally recognized (yet).

Many religions openly fear and promote fear of anyone who is "Not of the faith" so yes, the delusional theist (takes things on faith over facts) is taught and some do fear atheists. I am not just asserting this without merrit. One of the Catholics I de-converted (he is now a much happier atheist) told me because his church promoted fearing atheists, he was originally afraid of me. I asked another theist I de-converted and he confirmed the other former theist's point.

Athephobia is totally made up. What does Athe mean?

So an irrational fear of god, not the stupid god fearing bollocks of the religious, is Theophobia so does that therefore mean that Atheophobia is a fear of no god?

You can't have an irrational fear of an atheist until they tell that they one, we don't look any different, other than rolling our eyes a bit more often, so what's the fear of? You have a fear of someone, but your not sure who, who doesn't believe in your god but not a fear of someone who doesn't believe in the same gods you don't believe in?

And is it specific to atheists, surely we could contrive something for agnostics although the word soup necessary is not worth the effort.

It's utter tripe and should be given no credence whatsoever.

I've never heard that term before, but it seems to me that there could be two distinct concepts here. One is the fear of atheists (=people) and the other is the fear of atheism (=a worldview). Certainly there has been and still is a fear of atheists by some; But I think fear of the worldview itself is also real and prevalent. Christian parents fear their children will be seduced by it and as a child I went through a phase in which I feared I might lose the faith (=become an atheist) and go to hell as a result.

you can probably make that argument for just about anythng

Just another made up thing by theists

I think a fear of atheism is also related to just being afraid of just how insignificant any individual really is in the great scheme of things, or a fer of not having any real significance. If there is no god, then there is no plan which measn they feel like they don't really matter.

It threatens theists' delusion.

Oh, yes. There are plenty of people who are terrified of our existence.