Islam
Shahadah
awaitingAdminReview
happens
A person declares, with sincere belief: "I bear witness that there is no god but Allah, and that Muhammad is the Messenger of Allah." Many do this in front of witnesses at a mosque, and some then take a ritual bath (ghusl).
why
Islam is entered by belief and testimony; there is no initiation rite and no priest is needed.
origins
The first pillar of Islam (Bukhari 8).