I'm not horrified. Using skeletal remains in religious worship is part of many religions, Christianity is just one of them. Integrating them into a place of worship is unusual for us in this day and age where we prefer to painstakingly ignore the more physical aspects of death, but a look through the crypts of the Vatican or many old churches will show you that previous generations were in fact more upfront and in your face about the whole thing. The skeletal part of death was the thing you could grasp even if you were otherwise illiterate.
If these were the remains of, say, Muslim fighters from the Osamanic days paraded in a Christian church I'd have a bitter taste about it, but those skeletons there were used to commemorate, not desecrate or ridicule.
Just don't let a dog into that church!!!
Uwe