Is Christianity based on older myths?

[Minimalist]

In Richard Carrier's "On the Historicity of Jesus" he makes this observation:

In Plutarch's biography of Romulus, the founder of Rome, we are told he was the son of god, born of a virgin; an attempt is made to kill him as a baby, and he is saved, and raised by a poor family, becoming a lowly
shepherd; then as a man he becomes beloved by the people, hailed as king, and killed by the conniving elite; then he rises from the dead, appears to a friend to tell the good news to his people, and ascends to heaven to rule from on high. Just like Jesus.

If anyone wants to read Plutarch to check up on Carrier it is available on line. Plutarch cites Diocles of Peparethus as his source and this man lived c 300 BC. You see, historians...unlike bible bullshitters....discuss their sources.