Skiz...The main question is whether the religious environment of the early centuries CE could, without any need for miraculous intervention, fullly explain and account for the emergence of a new cult with a dying/raising godman. Students of religious history and developement see obvious kinship between the Jesus cults (there were many) and other mystery (meaning professing to have secret knowledge) cults that developed both before and contemporaneously. It is a modern Apologist tactic to confuse the matter by suggesting that if this one cult can not be shown to have fully developed prior to the emergence of the Jesus cult, then the Gospels are true. It is like the O.J. lawyers suggesting that "if the glove doesn't fit you must aquit"! The question you asked is easy to answer from the information already provided. No, we know very little about the Persian cult other than his virgin birth and some stories wherein the Mithra charater plays a minor role. Early authors and historians did assume too much in concluding the Persian Mithra god had a cult similar to the Roman form. In fact it would have been VERY surprizing if it were so. Cults and traditions never remain unchanged for hundreds much less thousands of years. The Roman Mithra cult was a product of it's time and religious environment. Cults of Artemis, Attis and Dionysus had wide followings. Osirus was making a comeback. These and other political developements forged a brand new version of the Persian myth in the first centuy BC. Similarly cults like those of Jesus and Apollonius of Tyana were products of the times. This is why they share stories and imagery. Cults and legends grow collaterally from common soil. Bull slaying and blood sacrifice,virgin/immaculate births, half man half gods, miraculous cures, control over natural forces, expelling demons, births and deaths coinciding with the Solstices or Spring/fall agricultural cycles, sage counsel and calls for religious reforms are standard material from this period. Precedents of these motifs in some cults date back thousands of years BC. Don't miss the forest for the trees.