As for the Catholic thing... Most Christian churches all use the cross, but unless I'm mistaken, it's only Catholicism (and perhaps Eastern/Greek Orthodox) that uses the actual "Christ on the Cross" icon in their churches... At least that's what I was taught in my RCC upbringing... I would be very surprised to see that in a Baptist church...
I give them a break with this incontunity because I think there was supposed to be a lot of irony happening praying to the dead Jesus on the cross who was re-born. Or perhaps I'm reading too much into that imagery?