The immaculate conception was a lie
Only Matthew and Luke claim that Mary was a virgin when she conceived. The rest of the New Testament ignore that fact and even deny it. Clearly Matthew and Luke were of the belief that anything to do with sex was dirty and couldn’t have the son of God created in this way. There is no explanation as to why or how Matthew & Luke came to this conclusion and no one else even mentions it. Wouldn’t this have been a huge miracle that everyone would have mentioned on a regular basis when defending/supporting Jesus? And Matthew doesn’t mention telling Mary, only Joseph is told, and only as he is considering putting her away privately (whatever that means) for being pregnant before he had had sex with her. But Luke states that an angel pre warns Mary even before God ‘visits’ her.