Has there been an atheist possessed by a devil?

You have to believe in the devil before you can believe you're possessed by the devil.

A person can battle the devil using fasting and the angelic psalter of the Virgin Mary.

Actually, no = Atheists left the devil for 'christians' to always mention, and prayerfully verify.

Atheists are not in need of being possessed.
'christians' seem to know every square inch of he|| .... and they do possession, so well.

I had a gastrointestinal virus a while back that seemed pretty close to most description's I've heard of demonic possession.

That's me - and oh, what a lovely devil she is! My devil in a red dress, devil in a red dress, devil with a red dress on! Red hair, too...nice red, pouty lips. She wears my wedding ring proudly!

no,
unless you can prove the devil exists first

No but many Theists have for after all the devil is another one of their gods you know.

Any that have been converted by a Christian ministry.

You say it's the devil.

I say it's an epileptic seizure

No. No one has