10. Ordo Templis Orientis
Also known as the Order of the Temples of the East (or OTO), the organization has taken some inspiration from Masonry. It is led by Aleister Crowley and his religious system called Thelema, which follows one law: “Do what thou wilt shall be the whole of the law, love is the law, love under the will”
Worldwide, the organization has 3,000 members and has quite some elaborate rituals, such as a mass that uses virgin priestesses, children, and priests, invoking Ancient Egyptian Gods, the Devil and it also includes a naked ritual performed by the priestess.