My oldest attended a Southern Baptist preschool in a southern state for about 6 weeks.
We pulled him after a fire and brimstone lesson about Adam and Eve left him terrified.
I don't know if that was an exception, rather than the rule, but my Missionary Baptist BIL was not surprised.
The DC area is more liberal than the south, so perhaps that type of passionate lesson would not occur in preschools here. If something like that would concern you, ask other parents before you join. The school he was at was highly recommended, but I never asked specifically about fire and brimstone
