Regarding the idea that people wouldn't die for a lie, there is no shortage of religious martyrs throughout history and into the current day, but they do not all belong to the same religion or share the same beliefs. Thus, it's pretty clear that people will die for a lie. They apparently do it all the time. They may not think it's a lie. Even now, there are billions of people who believe in the wrong god, or the wrong version of god. And if there is no god, then they're wrong to believe in god at all. And if there is, then they're wrong to disbelieve. And so on...
Regarding the unverified and unverifiable claims in an old religious text, the fact that they're unverified and unverifiable should suffice to dismiss that argument. Without a whole raft of presuppositions, I would argue that it is impossible to support any religious belief. I would also point out, as above, that there is no shortage of religious texts that people either once believed or still believe. There isn't even a majority of humanity that believe in one particular religion. This alone speaks against the idea of a god who wishes to get to know us personally, or who has any interest in our salvation.
Regarding the question of infinite regress, I cannot dismiss god as a possibility by using infinite regress. The fact that we are here would imply that there is either something that was always here, or that somehow the universe was born from nothing. If we have to define "nothing" as anything other than nothing, I don't see where we've made any progress on the question. I fully admit that astrophysics is well outside of my understanding, so maybe there's an explanation that makes sense, but I haven't heard it yet.