If they are using abusive language (which religious culture is full of--talk of "fear" and "sin" and "purity" and "forgiveness" and "should" statements) and ESPECIALLY if they continue after you tell them to stop.

Only slightly more than someone trying to sell me a material object that I am not interested in. I would consider it an imposition on my polite nature and not abuse per say. Though I have been witness to both salesmen and proselytizers that had it been me, I may have considered abusive.

I think you left yourself wide open for his "pitch" by telling him your studying religious stuff. He tried to sell you on his version. Next time you'll be a little bit more wary about giving out info to strangers. It's ok to say no.

Yes, that is mental and verbal abuse.

There is a general acceptance of behaviour in the workplace. I believe you needed to tell the person that action would be taken should he not desist. The pain /pleasure principal.

Why was the realtors husband even there? The realtor couldn't drive themselves?? I would drop the realtor and let them know why...and maybe leave a warning yelp review to keep others away from having the same preachy hour occurring to them :-/ Even if you have signed a contract with them, you can get out of it and work with someone else.

I'd be telling the realtor that because of his behavior I'll be finding another realtor. Hit them in the pocket book, it won't "save" you from the abuse you just suffered but maybe it will save someone else when he keeps his mouth shut.

At the very least I think you are right about it being a form of manipulation. But I think that about religion in general. I see that you wanted to respect his beliefs but he wasn't respecting yours by stopping when you asked him to stop. I would report him to whatever realty group he works for.