By continuing to push when someone asks them to stop or say no. Often times, using state compulsion on others. Forced assimilation and conversion. Making children, possibly of other religions, pray to a God they don't already worship.I'm not sure how people impose their religion onto another unwilling person
I know that the aforementioned is not basic proselytizing, evangelizing or witnessing. People are and should be free to do so in an open public space. They shouldn't be allowed to use compulsion or coercion.