A friend shared with me that he can't believe in Christianity because it's obvious we borrowed our traditions from other religions that existed before Christianity. Any advice? This is his note to me:

The similarities of beliefs and religions that predate Christianity. take for instance: Horus 300B.C., Attis 1200B.C., Dionysus 500 b.C., Mithra 1200 B.C..............Most of which were born of a virgin, Dec 25th birthday, performed miracles, known as the Light Alpha omega etc., Dead for 3 days, resurrected.........It seems to me that traditional Christian values were infact barrowed from other predated beliefs. Including the pegan cross.......