If you want a Christian group, I suppose you would just go to a Christian church (shop around) and probably some were ex-Mormon.
If you want an ex-Mormon group, Christianity isn't necessarily how they classify themselves as a group. There are probably Christian ex-Mormons who associate or go to a particular Christian church in Logan. Maybe someone knows of some.
If you stick with Mormons, they are trying to be more like other Christians over time.