DY: To your last comment, again, that just doesn’t make sense. Why are we making Sevaras about what they worship or don’t? Just ask them.
R’ Meir and RSHB”G are about assumptions. The Chachamim disagree because they’re not worried about assumptions, they’re worried about Metzius. And Rabbeinu Tam clearly disagreed with Rashi and others as to which Tzad the line in the Gemara is talking about (unless you’re talking a different Rabbeinu Tam).