A televangelist is someone who makes regular television broadcasts to promote a particular form of Christianity and raise money for particular Christian groups or projects.
televangelist in British English
(ˌtɛlɪˈvændʒəlɪst)
noun
US
an evangelical preacher who appears regularly on television, preaching the gospel and appealing for donations from viewers
Word origin
C20: from tele(vision) + (e)vangelist
televangelist in American English
(ˌtɛləˈvændʒəlɪst)
US
noun
a minister who uses TV broadcasts or cablecasts to spread an evangelistic message, solicit donations, etc.