[[Is this a CPUSA Presbyterian church?]]
I don’t know but it most likely is .
No, it wasn’t a PCUSA church.
It was the denomination’s general assembly. Which probably would have been clear if there was a link to the source http://www1.cbn.com/cbnnews/2016/june/mainline-christian-denomination-praying-to-allah instead of trying to drive hits to a blog.
Of course, then we would have also seen that the story was over a year old instead of the date given here. (Date on original story 06-29-2016).
By the way, the blogger is also a liar. It wasn’t a “typical Sunday morning service”. As I noted, it was the General Assembly (the opening session, not a worship service).