I take the good with the bad. I'd prefer they not be spewing false doctrine, but since I have no control over that the best I can do is engage them to learn and refute.
I can see that...but it's difficult too because...well, it's like someone in a certain denomination, or even someone in a cult for that matter come to think of it - there are certain things they're taught but not all believe every thing. Do you see what I'm saying? Like, some baptists believe you aren't saved without a water baptism in ADDITION to your Holy Spirit Baptism. Other baptists believe it's not necessary, but they certainly think it's a good idea to make profession of faith before the world.
To engage with a baptist, you try to find out where within the gamut they are.
To engage with even a mormon, I've found this to be true. (And no, I'm not comparing mormons to christians).
Do you see what I mean? No one falls within strict parameters, even among us christians. Or even among those in a cult. Even among dog trainers and what they believe is the best way to train a dog. Heavy hand authoritative, gentle guidance, etc.
So to engage with anyone really, we have to let them paint short strokes. We have to give THEM the paintbrush. From the short strokes they paint, we begin to get their broader ideas. We engage with them by listening to how they explain what they believe, not by TELLING them what they believe. For me to walk up to every baptist I meet and tell them I don't think they really understand what the sacrament of baptism really is, or what it stands for or shows a picture of, is to tell them what they believe. It is not finding out what they believe. It is not engaging with them. It is not giving them the paintbrush and then listening to understand them. And it's not true of every baptist, every time, who I meet, so it's not fair to them as single persons.
I can't meet one baptist or one catholic or one pentecostal and then insist they all believe the same exact way about everything, because they don't. And it isn't really engaging with them to walk up to them and begin to tell them what they believe. It isn't even letting them speak at all.