You mean just like the Catholic Croats never seem to mention the fact that they and the Muslims were joined at the hip in killing Serbs and Jews during WWII together under the Hitler-backed "Independent State of Croatia"? The union of fascism and the hatred of Serbs and Jews, was even stronger than their religious differences.
Both the Croats Catholics and the Bosnian & Albanian Muslims used each other to get what they wanted -- then and now. So don't assume "the Catholic Croats" were "Catholic" in any sense that most American Catholics would understand or condone! Catholic Croats were "Torquemada-style Catholics" who found greater commonality with Muslims than they did with fellow Christians of another denomination. And Catholic Croats backed the same Muslims who created this flag:
You can say, "That was 60 years ago." But the fact remains that less than two weeks ago the funeral of the WWII Death Camp commender Dinko Sakic was buried in his full Nazi regalia, with a crowd of Croat mourners and a Croat Catholic priest saying that the WWII Croat Nazis laid the foundation of today's Croatia!