One criticism of Christianity is that it was cobbled together from bits and pieces of other religions and deities that came before it, and therefore, there’s nothing unique about Jesus, His life, etc. A frequently mentioned example of this is the Egyptian god Horus, who supposedly bears many parallels to Jesus.
Jon Sorensen explains why this is not the case. For example, regarding the claim that Horus was born of a virgin, just like Jesus:
The mother of Horus was believed to be the goddess Isis. Her husband, the god Osiris, was killed by his enemy Seth, the god of the desert, and later dismembered. Isis managed to retrieve all of Osiris’s body parts except for his phallus, which was thrown into the Nile and eaten by catfish. (I’m not making this up). Isis used her goddess powers to temporarily resurrect Osiris and fashion a golden phallus. She was then impregnated, and Horus was conceived. However this story may be classified, it is not a virgin birth.