I don't know the Catholic faith but I understand that they believe that Mary was always a virgin.
Protestants don't hold that belief. I believe she was a virgin until Jesus was born and then she and Joseph lived a normal married life.
The book of Matthew speaks of Jesus' siblings.
He had begun preaching in His hometown and the people knew Him so it was hard for them to believe that He could be the Christ.
Matthew 13:55, 56 Isn't this the carpenter's son? Isn't his mother Mary, and aren't his brothers James, Joseph, Simon and Judas? Aren't all his sisters with us?..... So it looks to me like He was the oldest in a large family!
There are other differences in belief. I think the one thing Christians must agree on is that Jesus died to pay for sin and that He was resurrected and is now in Heaven at the right hand of God the Father.
I think we will sort out all the fine points when we see Him face to face. <img src="/images/graemlins/smile.gif" alt="" />