I'm currently playing as the Mamluks (also have a save game that I haven't really played as Hedjaz) and I started out at war with Trebinzor and Georgia (have conquered and annexed both). I was just minding my own business while looking over the campaign map, I saw Poland move in and grab Sunni provinces in a land grab over in my direction (I have Hedjaz, future Iraq, Hedjaz and Ottomans as neighbors) so I created a couple armies, secured military access and marched on over to declare war on Poland. When I did, Poland, Lithuania, Austria, Ottomans, Wallchalia (sp?) all declared war on me. I also lost favor with Hedjaz (who I've proclaimed a guarantee on to protect Mecca and Medina) and the future Iraqis.
Is there a way to declare war and take on the grand alliance without losing favor with everyone? (or if I'm so sworn to protecting and can't bring myself to attack Mecca and Medina should I just be Hedjaz?)