Unfortunately, there are tons of cults and new religions that define themselves as "Christian", so I advise you to Google the name of that church or the religion. 
Kwa bahati mbaya, kuna vikundi vingi vya dini mpya vinavyojitangaza kama "Wakristo", kwa hiyo ninakushauri utumie mtandao wa google kupata jina la kanisa au dini ya kujiunga nayo.