I found this to be a beautiful gesture.

PARIS -- In a gesture of solidarity following the gruesome killing of a French priest, Muslims on Sunday attended Catholic Mass in churches and cathedrals across France and beyond.
Reporters on the scene said that between 100 and 200 Muslims gathered at the towering Gothic cathedral in Rouen, only a few kilometres from Saint-Etienne-du-Rouvray, where the 85-year-old Rev. Jacques Hamel was killed by two teenage attackers on Tuesday.
"We're very touched," Archbishop Dominique Lebrun told broadcaster BFMTV. "It's an important gesture of fraternity. They've told us, and I think they're sincere, that it's not Islam which killed Jacques Hamel."
Outside the church, a group of Muslims were applauded when they unfurled a banner: "Love for all. Hate for none." Similar interfaith gatherings were repeated elsewhere in France, as well as in neighbouring Italy.
Mohammed ben Mohammed, a member of the Union of Islamic Communities in Italy, said that he called on faithful in his sermon Friday "to report anyone who may be intent to damage society. I am sure that there are those among the faithful who are ready to speak up."
"Mosques are not a place in which fanatics become radicalized. Mosques do the opposite of terrorism: They diffuse peace and dialogue," he added.