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Jack Wheeler has the entire play up here and writes:
The claim is being made that Voltaire wrote Mahomet as an attack on religious fanaticism in general and as a disguised attack on Christianity in particular. Nonsense. He dedicated the play to Pope Benedict XIV, who wrote back a letter of appreciation.
Voltaire knew his Mohammed and Koran. The characters of Seid and Palmira are taken from Mohammed's adopted son Zeid and his wife Zainab bint Jahsh. Mohammed's lechery over Zainab caused him to invent a Commandment from God saying that God ordered Zeid to divorce Zainab and that is was Divinely OK for Mohammed to marry his daughter-in-law. This is in the Koran, Sura 33:37.
The play is a direct assault on the moral character of Mohammed by Voltaire. This is a classic work by a classic Western writer and should be performed on Broadway, by drama clubs and college/high school thespian groups all over the country.