That would go against one of the most basic aspects of Christianity: Jesus was the son of God.
Matthew 1:18-19: Now the birth of Jesus Christ was on this wise: When as his mother Mary was espoused to Joseph, before they came together, she was found with child of the Holy Ghost. Then Joseph her husband, being a just man, and not willing to make her a public example, was minded to put her away privily. (KJV)
Jesus was conceived by the Holy Spirit. Mary had not yet had sex with Joseph, as they were not married - hence why Joseph was surprised that we was pregant and planned to quietly break the engagement off. Similarly
Luke 1:34-35 says that Mary questioned how she could become pregnant, seeing how she was a virgin, and Gabriel explained that she would conceive with the Holy Spirit.
But yes, that's a topic for another thread.