Immortality that is proven to work entails a contradiction due to the 2nd law of Thermodynamics, as well as being able to know the pill works only to the age of the oldest person that has taken the pill with no deaths that are not suicide or accident. Therefore, given the impossibility of proving the pill works to provide immortality, I would consider the belief that the pill has conferred immortality to be a religious belief but not necessarily a religion in itself.
If it has been shown that the pill does increase the life expectancy dramatically with near certainty then I would take the pill under the expectation of living longer but not being immortal.
Fair enough, suppose the pill only increases life expectancy. In that case would you say anyone who believes it works is religious.
Most transhumanists also don't necessarily believe in living forever, they just want to live for a very long time. My point was that if the evidence suggests this is possible, it is not a symptom of religious faith to believe that it is possible. If you disagree, the correct approach is to discuss the evidence, not go throwing ad hominems around.