It’s a stronger one than the Catholic church or you have provided.
John 20:19 has nothing to do with His birth.
Jesus ability to walk through walls in His RESURRECTED body does not imply any special ability to pass through Mary’s body that way before His death. That’s a complete fabrication and the most wishful thinking I’ve ever seen.
Jesus shared with us in His humanity.
You guys are unreal (and unrealistic) in your imaginative stretches to justify the doctrine of Mary’s perpetual virginity.
She didn’t NEED to remain a virgin after the birth of Christ. It served no purpose and was irrelevant to the work of Christ on the cross.
You guys need to get your focus back on Jesus.
But Jesus did a lot of miracles that showed supernatural ability before His resurrection. He did, for example, walk on water.
She didnt NEED to remain a virgin after the birth of Christ
She had no such obligation, to be sure, but it is reasonable that she did. Her womb was the true tabernacle, after all, something not to be touched.