"Which one is not just a bunch of myths, but is historically factual, and which one(s)' portrayal of reality is commensurate with the way reality really is?"
If anyone knew the answer to that and could back up the claim of which
religion was true we'd likely be following that particular religion.
Most all religions and denominations within those religions can and are
challenged by the believers in other religions.
We are right is the cry, or W.A.R. or WAR.
Belief in a particular renders down to faith.
Faith is something that can neither be proven nor dis-proven.
What religion has documented evidence that lends one to believe that religion
has some bases in facts?
Well....
Is the existence of Jesus historically proven?
In 90A.D. the Jewish historian Flavium Josephus, in his work entitled Antiquities (Book 18, Chapter 3 Para. 3), reported on the historical existence of Jesus as follows:
"Now there was about this time Jesus, a wise man, if it be lawful to call him a man; for he was a doer of wonderful works, a teacher of such men as received the truth with pleasure. He drew over to him both many of the Jews and many of the Gentiles. He was the Christ. And when Pilate, at the suggestion of the principal men among us, had condemned him to the cross, those that loved him at the first did not forsake him: for he appeared to them alive again the third day, as the divine prophets had foretold these and ten thousand other wonderful things concerning him."
Other sources besides the Bible testify to the life of Jesus. For example Tacitus, the Roman historian, Suetonius, the Roman court official under the Emperor Hadrian, and Pliny the Younger, the Roman governor of Bithnia in Asia Minor.
So it's reasonable to conclude then that Jesus did exist.
Other than that I can't say.