[Elendur]

, or an angel from heaven, preach any other gospel unto you
///
i have no doubt, that the “angel” that appeared to Mohammed in the Cave, and shook him and terrorized him
(instead of reassuring him, as ALL other angels do),
was Satan himself,
appearing as an angel of light,
as Jesus himself warned us, he could still do.
-
and so, Muhammad became the false prophet, forseen.

[Yosemitest]

Yes, remember:

For such are false apostles, deceitful workers, transforming themselves into the apostles of Christ.
And no marvel; for Satan himself is transformed into an angel of light.
Therefore it is no great thing if his ministers also be transformed as the ministers of righteousness;
whose end shall be according to their works.