TonusOH, not much different than the claim that most of the 2 billion who currently claim to be Christians are mistaken. If you’re inclined to accept or reject one you’re already inclined to accept or reject the other.
Vanderhoven7 it is Stark who argued that the figures in Acts are unreliable, not me.
What Stark’s projection shows is that it’s perfectly possible that Christianity got off to a slow start in the first century and yet nevertheless became the majority religion by the mid 4th century. The line could easily have been steeper in the first decade and then slower after that, which would be compatible both with the figures in Acts and the implication of Watcthower teaching that there were fewer than say 70,000 Christians in the first century.
Remember Watchtower is not claiming that history can prove their idealised numbers are correct. It’s opponents of JWs who imply that their numbers are historically not possible. I think Stark’s projection shows that they are possible because growth from small numbers compounds slowly at first but gains momentum over time.