See what God says to muslims about Christians:
" And do not argue with the People of the Scripture except in a way that is best, except for those who commit injustice among them, and say, "We believe in that which has been revealed to us and revealed to you. And our God and your God is one; and we are Muslims [in submission] to Him." The Quran (29:46).
Actually the priest of the church invite him to church to hear what is islam.Plus the church is converted to mosque because too many people voted to convert to be mosque