according to the dictionary, a religion means you believe in something. atheism is believing there isn't a god, but that is also something you can't prove. agnosticism wouldnt be religion because they are unsure
"Zionist churches are a group of Christian denominations that derive from the Christian Catholic Apostolic Church, which was founded by John Alexander Dowie in Zion, Illinois, at the end of the 19th century. Missionaries from the church came to South Africa in 1904 and among their first recruits were Pieter Louis Le Roux and Daniel Nkonyane of Wakkerstroom who continued to evangelize after the Zionist missionaries left in 1908."
It appears to be quite popular South Africa too, but only in Eswatini is it the most popular denomination.
Did they change religion when they changed their name?
"Zionist churches are a group of Christian denominations that derive from the Christian Catholic Apostolic Church, which was founded by John Alexander Dowie in Zion, Illinois, at the end of the 19th century. Missionaries from the church came to South Africa in 1904 and among their first recruits were Pieter Louis Le Roux and Daniel Nkonyane of Wakkerstroom who continued to evangelize after the Zionist missionaries left in 1908."
It appears to be quite popular South Africa too, but only in Eswatini is it the most popular denomination.