Peepholes are a great help. Unless it is a face I know or a uniform, the
door usually doesn't get opened. Fer damn sure it doesn't get opened for
shiny young faces, white shirts, and ties. They go away eventually.

Of course. You don't have to open the door if you don't want to.

I should add that the mainstream Christian churches with which I am
acquainted (Baptist, Methodist, Lutheran, etc.) normally only visit people
who have contacted them to request information. Very rarely (at intervals
of several years), they take surveys of the immediate area of the church, to
learn about the neighborhood, but that is not the normal form of visiting.