You read his book...good for you. I have less than no desire to.

He is no longer to act as a Roman Catholic priest.  Period.  

When you write a letter describing your intentions to do things defying the organization you work for, blasting that organization, thanking someone for past tepid support, and separating yourself....I think most companies would accept that as an indication of resignation.  

I am not the only one who sees it that way, as the citations I gave you indicate.  There are many, many more of course.  

Not an excellent priest at all in my estimation - but someone who acted with subterfuge and dishonesty until it suited him and he could make a big splash for his book and ego...and who perhaps was used by those with a certain agenda. No.  Excellent would be an honest, forthright man acting with dignity and respect instead of flair and ego.