The Mandaeans
Judaism, Christianity and Islam aren’t the only Abrahamic religions. A number of minor religions still survive that are not part of any of the other three, including Mandaeans, Yezidis, Druze and, still, Samaritans.
The Mandaeans
Mandaeans (aka Sabians) originated in the third century CE.
They have the distinction of being named in the Quran as one of the other “Peoples of the Book”, along with Jews and Christians, meaning in Mohammad’s estimation that they are believers in the true God.
Today there are 60-70,000 Mandaeans around the world including 10,000 who live in Sydney, Australia.