Well, more power to you: you can't please everyone.
This is false. The Enigma is what they are trying to solve, and each path is a different philosophy to the solution. The difference is that the Enigma is now actually defined.
Yep. Only the servants of the Divine are right, in game. Every other form of immortality in TMRE is wrong too, I'd point out. They are less wrong than most Hermetic magi.
For the same reason that all of the other Hermetic magic works, despite being flawed.
Criamon can have magical tatoos, and simple rules for it are given in the chapter. They are just before the rules for skull-binding.
The reason for the change is that, as originally designed, TMRE was meant to come out first, and it has rules for both Inscription on the Soul and magical tatoos. Each book needs to stand on its own, so it was either have you, the reader, pay for exact duplicates or choose to just refer to the earlier (now later) book and use a simple system that you hadn't seen before, that was novel.
Well, there you go...this chapter was not for you.
Then use the old one...I'm not forcing you to change. I'd point out that I wrote the detailled version of the old one in ArM4, in Sanctuary of Ice, so I have to say I'm suprised by people defening what was written deliberately as a substanceless void, but maybe its flaws are more obvious to me because I had the chance to seriously look at it. I'd also point out that 4th ed Criamon fit perfectly well in the new system, because I wrote the detailled version of both and made sure it was the case, and its a requirement on all authors that such be the case.
Well, then it just wan't the book for you. Better luck with the Infernal, eh?