Religious Pressure - How Does it Work?

Not quite nothing. You get 100 points base internal pressure for each convert within a city, (also including the atheist pressure of the no-religion pops). This pressure works to resist spread of other religions since the externals have to passively overcome that base pressure to convert population over.

The minimum counter-pressure/resistance would be a city that was converted at one pop, since the pop it was at when the atheist pressure stopped being the majority is the base resistance you can expect in any given city, even after an inquisitor event. (So far nobody in the other thread has shown a mechanism for removing the no-religion portion of the base pressure, so I'm assuming the initial no-religion pressure is going to persist.)

edit - The spreading pressure, yes you are right, that value is independent of the spreading city's population.
 
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