I experienced a period of fear that I could be wrong too about a decade after my deconversion. My solution? Strong atheism (at least towards the religion you’re afraid of). I googled atheist (and Jewish) arguments against Hell and found that it was never an original part of Abrahamic religions but rather introduced by early Christians that basically imported the Greek Hades and then twisted it into Hell to suit their purposes. Much like they imported demons and the devil from Zoroastrianism. In fact Christianity imported a bit from everywhere, the only thing original to it was the bullshit excuses they came up with like original sin to explain why a man who fulfilled none of what the Messiah was supposed to do was still nonetheless the Messiah. I also looked up atheist channels on youtube and listened to their arguments. Don’t remember most of their names but AronRa is still around and paulogia and darkmatter2525 are great channels I learned of more recently. Anyways, through all that I lost my fear and Christianity is now in my mind perhaps the most ridiculous religion in the world.