But I mean, the ISIS case is
clearly superior in the quality of evidence. In the ISIS scenario, you have 500 unique first-hand, eye-witness testimonials. In the bible case, you have 0-5 1st hand accounts (depending on your view of who exactly the authors of the gospels were), and the accounts of all the other eye-witnesses are
second hand. That is to say: if you have any sober evaluation of the evidence at all, you
must conclude that 500 first-hand accounts ARE NECESSARILY better witness than a second-hand account of 500 first-hand accounts. The only way you can possibly deny this is by doing exactly what you’ve been trying to do: inventing reasons for suspecting the ISIS fighters that weren’t in the original scenario.
(Invention #1: the resurrected person & followers endorsed the Muslim interpretation of the bible)
We know that the OT is not reliable for a number of reasons, such as
archaeology. That is to say: the authorship, dating, and historical claims of the Old Testament are even less well established than those in the New Testament. Of course you will object: but we don’t take a literal view of the bible! Of course you don’t, but that makes your interpretation of the claims made in the Old Testament subjective. Specifically, you are interpreting them in the way that is most favorable for your interpretation of the New Testament. I.e. you form your view of the Old Testament assuming that the New Testament is correct, instead of forming your opinion of the Old Testament in a vacuum, then applying that opinion to the New Testament.
(Invention #2: The fighters who continue to sacrifice their lives for their belief in the resurrected guy are trying to accomplish the same things as before the resurrection)
I mean, Catholics are pretty proud of the “On this rock I will build my church” passage, which is not meaningfully different from a leader saying “on this rock i will rebuild my caliphate.” Clearly both groups of people are motivated by strong belief in some eternal reward over temporal rewards, and crucially, the concept of eternal rewards would not be a new concept invented by the resurrected person.
(Invention #3: That the resurrection easily fits into the ISIS narrative.)
What were some of the teachings of early Christianity? Be more kind to the poor. Deny the authority of the Sanhedrin and challenge the necessity of following Mosaic Law. A belief in human equality. People fight and die for those kinds of beliefs all the time. Why is it unreasonable to think that a group fighting for these beliefs wouldn’t try to get some religious legitimacy by claiming a miracle consistent with the prevailing religion of the time? Why is it unreasonable to believe that people fighting for those causes might believe that those causes are implied by
their correct interpretation of the prevailing religion of the time. Or even that
their correct interpretation required them to act the way they did for an eternal reward.