I'm not at all sure that any religion started with something real. I see that there have been cults started in people's lives, some successful. I see that there were cults started in the 1800's that are flourishing religions today, for instance the Mormons. I see that there were branches of Christianity started 500 years ago that survive to this day. Some over demonstrably trivial things. (Various branches of Protestantism, and a demonstrably trivial one is the Anglican Church, founded for Henry VIII's marital convenience.)
I see no reason at all to believe that the rules that govern human behaviour over the course of a few thousand years differ from those of a few hundred. Therefore I see no reason to believe that there is a fundamental difference between those events and events in Mohammed's, Jesus Christ's, or Moses' days. (In fact I don't believe that there is a fundamental difference, that's why I'm an atheist.)
If there is anything obvious that I'm missing, please inform me. If my beliefs happen to offend you, as far as I'm concerned that is your problem. Plenty of religious people can accept that I believe this and content themselves with believing that I am wrong. After all this does come down, at some point, to faith. But my beliefs seem to me to be reasonable.
Regards,
Ben