Considering the Crusades, Reconquista, and pretty much all anti-Islamic activity in Medieval Eurasia were performed by the Catholic Church, did the Muslim powers (I guess mainly the Ottoman Empire) offer to help Lutherans and other early Protestants in their struggles? Did they simply try to make the schism and inter-religious violence worse? Were there any commentaries on the similarities to Islam's own Shia/Sunni split?
Hi Catfish!
You may be interested in my previous answer to a question regarding Ottoman involvement in the Thirty Years' War:
Let me know if you have any follow-up questions!
This, of course, only answers part of your question, but hopefully it is enlightening for this specific war.