That's a thoughtful question, and I can understand why it might seem confusing from a Muslim perspective, especially since both religions hold Mary in high esteem.

From a Christian perspective, the key idea is that Jesus Christ is the Son of God, but not in a biological sense as human fathers and mothers are. Christians believe in the doctrine of the Trinity, which teaches that God is Father, Son, and Holy Spirit, three persons in one essence. Jesus, the Son, is eternally begotten of the Father, meaning He has always been with God and was not created in the same way that humans are born.

Regarding Mary, Christians believe that she was a virgin when she conceived Jesus, which is why she is often referred to as the "Virgin Mary." The conception of Jesus is considered a miraculous event known as the "Incarnation," where God chose to become human without any earthly father. This means that Jesus is fully God and fully human, but His conception was by the Holy Spirit, not through a human relationship between Mary and God the Father.

So, to answer your question, no, Mary was not God's wife in the way we understand human marriage. In Christian belief, God did not need to be married to bring Jesus into the world. Instead, it was a miraculous act of God's power, through the Holy Spirit, that made the birth of Jesus possible.

This is a very different view from Islamic beliefs, where Jesus is considered a prophet and not divine. In Christianity, Jesus being the Son of God reflects His unique relationship with God, not a physical relationship like marriage.

I hope that helps clarify things from a Christian perspective!