I will say this slowly... All Catholics are obliged to believe that which Holy Church declares to be Divinely revealed. The proposition that we "all believe in the same god" is nonsensical both theologically and eschatologically. Jews and muslims deny the Trinity. How, then, do they worship the same God as we? You and luther's rebels may be moving toward "intercommunion" {whatever that means}, but the Catholic Church is, always has been, and always will be in full communion with Her Divine Founder.