The units were staffed with German officers and NCOs, and the rank and file were partially added with Roman Catholics since the Croatian Leader Ante Pavelic felt that a wholly Muslim unit would seek to place itself as a military source of autonomy for Bosnia, and to secede from Croatia.
Also, the SS Handzar rebelled against the Germans in the small town of Villefranche in Southern France, during training.
No mention of that in the middle east digest, written by Joan McWhirter, her father a noted military general which no doubt she got her information from. Secondly, Hitler hated Catholics, So, I find that to be somewhat questionable, for other reasons as well. What is your source?