But to answer your question, if a Christian showed up on a Friday service at a mosque and tried to worship Christ in a traditional manner (proclaim Christ as God and take/share the Eucharist) or a devout Jew comes in wearing a Yarmulke and Talit quoting the Torah in Hebrew, they had better have a very good life insurance policy for their families' sake.
But, on the other hand, there are many stories of muslims who, out of curiosity or the feeling that "something's missing" in their "religion", attend a Christian service and eventually convert. If the intention is to proseletise and convert muslim attendees then I can understand the motivation. But there is no room for "compromise" or alliance between Judeo-Christianity and Islam. The former is, at its base, a faith based on the love of God the Father of all mankind and the universe. The latter is based on the preachings of a seventh century psychotic warlord.
[ But, on the other hand, there are many stories of muslims who, out of curiosity or the feeling that “something’s missing” in their “religion”, attend a Christian service and eventually convert. If the intention is to proseletise and convert muslim attendees then I can understand the motivation. But there is no room for “compromise” or alliance between Judeo-Christianity and Islam. The former is, at its base, a faith based on the love of God the Father of all mankind and the universe. The latter is based on the preachings of a seventh century psychotic warlord. ]
That is the best case scenario, but the worst case if that since they worshiped in the church that is now “belongs to them and their god”.....