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.
Anda harus jadi sangat agnostik mengenai ada atau tidaknya poci teh yang mengorbit dekat Mars, tapi itu tidak berarti Anda memberi peluang eksistensinya sama kuatnya dengan ketiadaannya.