Question

According to the Rabbi’s view that a secular person is not considered culpable for transgression—how is it possible to execute someone in a religious court for any offense? We have to worry that he may be an atheist! There is no way for us to know whether he is an atheist or a believer, since belief is not something external (see, for example, Haredim who are secretly coerced / outwardly observant), and asking the person himself would not work, since a person does not render himself wicked by his own admission (aside from the fact that he could simply lie).