That may be a mis-spelling of "baptist", a believer in a specific Christian denomination, or of "babi", a believer in the Bab, who founded a religion in Iran.
"Baptist" refers to a Christian denomination that emphasizes adult baptism by immersion in water. Baptists typically believe in the autonomy of the local church, the priesthood of all believers, and the authority of The Bible. There are different branches and beliefs within the Baptist denomination.