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Selfexpression The christian god is the one christians believe in. It's only one of many gods and goddesses. It wouldn't be mythical if it actually existed but there is no evidence that it does. All those things christians try to attribute to their god can just as easily be attributed to other gods such as The Flying Spaghetti Monster or The Invisible Pink Unicorn.
It's quite likely there were several people called Jesus wandering around 2000 years ago but there;s no evidence any of them was the son of any god. The reason the myth got spread so far is that the Roman Emperor, Constantine the Great, if not actually converted to christianity, tolerated it.
I don't understand your comment that
"The other religions you mention are not even around in the numbers of Christianity."
Are you trying the say that the validity of a religion is directly proportional to its number of followers?