Just Who Spoke to Mohammad?

2 Cor. 11:14 "And no wonder, for Satan himself, masquerades as an angel of light.' I think this explains how Mohammad believed he saw and spoke to 'Gabriel' as well as the excellent way Islam seems to be spreading and accepted despite how it behaves. We are warned not to accept any other gospel even from an angel. There are no cases where the true Gospel was preached by an angel except as yet in the future described in Revelation. Mohammad may not have known who he was listening to. How could he? There is a power behind Islam that fits Lucifer's authority as the god of this world, the Babylonian system.