In 1898 a book entitled Futility was written Morgan Robertson. It’s not a very long book, but the material and a few of the details are a bit … perplexing. The book starts off with descriptions comparable to a ship completed in 1912. The lengths and displacement are very similar. Their speeds were nearly identical. Both were considered as the largest ships in their day. Boldly, they were even declared to be unsinkable. And as such they met the minimum legal requirements for lifeboats. Though one was a story, and the other one real, they both were sunk by an iceberg. I am, of course, speaking of the Titanic and her predecessor in fiction the Titan.
What’s the point I’m trying to make? It is simply this: just because there are religions that have similar story characteristics (Mithras, Horus, etc. dying and rising from the dead*1), it does not follow logically that those other religions somehow discount the historical facts about Jesus.