Now without even going into the issue of whether Christians can agree or not that “Allah” is the appropriate name for God (some do, some don’t – this is really irrelevant here), it’s the second part which is crucial here: Christianity does not recognize Muhammad as a prophet at all. In fact, technically speaking, Christianity would most likely classify Muhammad as a heretic (if only because of his rejection of the “Symbol of Faith”). Saint John of Damascus even called him a ‘false prophet’. Simply put: there is no way a Christian can accept the “Shahada” without giving up his Christianity just as there is no way for a Muslim to accept the “Symbol of Faith” without giving up his Islam.