You would strictly have to be agnostic about whether there is a teapot in orbit about Mars, but that doesn't mean you treat the likelihood of its existence as on all fours with its non-existence.
Morali biste biti strogi agnostici po pitanju postojanja čajnika u Marsovoj orbiti ali to ne znači da vjerojatnost njegova postojanja smatrate jednakom kao i vjerojatnost njegova nepostojanja.