What do people think of the alleged similarities among Jesus, Horus (Egyptian god), Buddha, Krishna, and Mithra (Zoroastrian)?

Some believe the stories of these deities and religious figures to have common roots.

Let me assure you this isn't meant to insult Christians. The similarities are interesting, but I'm not trying to debunk anyone's beliefs. Just curious to know if anyone (Christian or not) has learned or read about these comparisons. I'm not sure if all the claims are true and don't present these as facts.