I listen to all these complaints about rudeness and intemperateness, and the opinion that I come to is that there is no polite way of asking somebody: have you considered the possibility that your entire life has been devoted to a delusion? But that’s a good question to ask. Of course we should ask that question and of course it’s going to offend people. Tough.
It's always better to speak the language of the team. Not only for the direct contact with everyone - sometimes it also helps you to understand the mentality of the people in the team a bit better.