I have a question about Verificationism. As I understand it Verificationists
Verificationists typically say that for a claim to be meaningful it must be empirically testable. Tossing a coin might test claims about gravity, mechanics, or the symmetry of the coin, but it does not test an unrelated claim.
It is probably meaningful to believe that Christ will return in 10,000 years (so long as we're specific about what "Christ" and "return" mean) but that does not mean it is plausible.
In thinking about what is rational to believe we need to consider both meaningfulness and plausibility.