Islam is a fraud.
The largest delusion to have ever gripped a major portion of humanity for almost 1400 years that has killed hundreds of millions.
If the fragments of what I understand about southwest Saudi Arabia in the 5th and 6th centuries bear up, Himyar was ruled by Jewish kings, one of them made war against the growing Christian population. A massacre of Christians triggered an invasion by the Christian king of Ethiopia whose force eventually defeating the Jewish armies.
All that before Islam even existed.
That history makes it easy for me, after living through the second half of the 20th Century, to imagine the prophet as a very early 7th century Jewish strategy to regain control of the Saudi peninsula.