I agree there are a lot of "weasel words".
But part of the "problem" is we've forgotten that people have a right to be idiots.
Individual Sovereignty = freedom of religion
Freedom of religion = a right to be an idiot and believe idiotic things
Respecting someone's right to be an idiot, and treating (respecting) their idiotic belief as you would (hopefully) treat any idiotic religion is the first step to COMMUNICATION.
You don't tell a christian that "jesus is fake" (actually "jesus is unfalsifiable"). That's not going to work.
You might ask a christian, "how would you fix the problems of the world?" and then listen.
I know this is going to be difficult to believe, but they will actually have some GOOD IDEAS.
That's COMMON GROUND. You can try and build on that, and sort of ignore the "other stuff" as best you can.
Build on the COMMON GROUND and try to expand it out, chart it out, map it out as far as you can.
Kinda like this guy,