Bill Maher conflates al-Hajaru al-Aswad, "the Black Stone" with the Kaaba, which is the building in which it is housed. There are several devotional objects in the Kaaba and Muslim pilgrims face the building rather than the stone.
All the comparisons between Jesus and Horus mentioned in the film are not taken seriously by any credible biblical or ancient Egypt scholar.
Bill's rant about Scientology's take on the Meaning of Life is improvised and a little inaccurate. 75 million years ago the Galactic Warlord Xenu, because of overpopulation, brought Aliens, not Humans, to Earth (aka "Teegeeack") having frozen them with glycol-alcohol, stacked them around a volcano and blew them up with Hydrogen Bombs. The souls or "Operating Thetans" of these Aliens attached to Primitive Man. This is the source of everyone's problems, which Scientology supposedly cures.
It was not Moses who introduced circumcision, it was Abraham.
Bill Maher claims a nuclear conflict would be driven by religion. During the Cold War, two of the major nuclear powers, the Soviet Union and the People's Republic of China were both state atheist, and at various periods actively persecuted religious people through imprisonment and even execution. Of the other nuclear powers, France has a secular constitution and the USA has official separation of church and state. The UK was the only early nuclear power to have an established church. Few of the people who were instrumental in creating the USA's nuclear arsenal were actively religious.
As there is only one, long revelation in the final book of the New Testament, it is known as The Book Of Revelation, singular, not Revelations, plural.