While it’s very far from mainstream, those things that become mainstream have to start somewhere with a small beginning and then become accepted and more prevalent, unless opposed.  An example of something like this is the recent change in thinking among a few Protestant churches to allow Muslims to use their facilities as places of worship.  Dr. Alex McFarland has it right when he recently stated that churches “have crossed the line from respect and tolerance, to ... affirmation and endorsement….  We as the church are called to show love, we're called to help. But to let a building simultaneously be used for the activities of a mosque and also the activities of Jesus Christ, it's just incompatible. And I think it's one more example of political correctness and hyper-tolerance gone awry." 

Further, he went on to say that, “"What if we went to Muslims and said 'Hey, can we use your mosque for the worship of Jesus, the incarnate son of God, the one that said 'no one comes to the Father but through him.' I doubt there would be a lot of reciprocity’."  The main point is not whether there is reciprocity, although, and hopefully there would not be Christian congregations wanting to use a facility dedicated to another god.  What should be remembered here is that the Christian congregation is not to be meeting for a social club gathering, but for the worship of God.  Buildings are built for the worship of God and are dedicated to the God that is worshipped.  God is not going to be glorified, nor happy, about a building that is sanctified for Him being used by those who bring in the worship of another god.  It’s hard to believe that this topic even has to be debated.