I suggest that, if the probability of the existence of God on someone’s evidence is not too low after adequate investigation, it would indeed be a best act to worship and repent before God. After all, if you receive a very expensive and much-desired present and it is unclear who has sent it, it would be bad not to write a very grateful letter to the person most likely to have sent it (even if it is not very likely that that person has sent it). You might express your gratitude in a conditional way (‘I’m assuming that you sent this’), but not to express any gratitude at all would be a bad thing. And if you have damaged the present, it would be bad not to apologize. A fortiori, if—although it is unclear who (if anyone) gave you life but the most likely candidate is a God—it would be very bad indeed not to express a very great amount of gratitude, and very considerable repentance.What's this about sending a letter to thank someone for a gift who is not very likely to have sent it, but the most likely to have done so? What's that mean? What does it mean to think the probability is "not too low"? How low can you go? Is this considered good apologetics? Oh, and one more thing, since we're talking about god here, which one? Usually believers will just conclude that they should thank the culturally dominant one. ;-)
--From the 2nd edition of Faith and Reason, page 223.