The burden of proof is always on the one making the claim. It's up to your friend to prove his assertion. Most of what appears to give Mary Magdalene "more of a role" comes from later pseudo-Gospels and gnostic literature written much later than the 4 canonical Gospels. St. Paul, who gives us the earliest Christian writings, never mentions Mary Magdalene. If she played such a prominent role in the early Church it seems odd that St. Paul would make no mention (good or bad) of her .