I can ignore it if it happens once or twice, but continually is rude and offensive...but I don't think they generally see it thst way. If it bothers me I will come to a point where I say that we all have to decide for ourselves what makes sense in this world, that I respect their views on religion, but can they also need accept mine. I promise not to disrespect them or attempt to sway their views if they will do the same. I tell them that I don't need saved or for them to pray about me. Save their prayers for aomeone who truly needs them. If they have a kind, forgiving God he will see that I have been a good person in my life and forgive that I could not believe in blind faith...and if he doesn't, it's probably not somewhere I want to be anyway.

Actually I turn the tables on them.
Two Can Play That Game.
No need to get your blood pressure up over nonsense. Just think of it as a game.

First of all, I would say your response should be proportionate to how important these people are to you. Kindness is always a good option - but how? Perhaps have a sit down with each of the offenders and make your feelings clear = all the while expressing your appreciation for their concern.