They see it as their Christian duty. But others disagree, saying it extends the hand of fellowship where it was never intended to go.
Two Protestant churches are taking some heat from critics for opening their church buildings to Muslims needing places to worship because their own facilities were either too small, or under construction.
Heartsong Church in Cordova, Tenn., let members of the Memphis Islamic Center hold Ramadan prayers there last September. And Aldersgate United Methodist Church in Alexandria, Va., allows the Islamic Circle of North America to hold regular Friday prayers in their building while their new mosque is being built.