Q:

New user removed? 

Someone was asking some good questions, about the possibility of the use of bribery in evangelization, and had evidence about poor rhetoric ("devil-worshippers") being addressed to non-Christians in evangelization.  The person was also responding very positively to suggestions about how things could be better worded in future questions, even politely said you can close this question.  
Q: Why was this person removed? 
If this were a question-and-answer site, all signs were positive.   If this site were to have evangeliziation purpose, then perhaps it's good to keep those asking questions as to whether elements of Christianity's dark underbelly had any biblical basis.   (Hint: I think  a polite Q-and-A exchange about dark-underbelly facts is actually the best evangelization there is). 

A:

Generally users are removed one of two ways:

They delete their own account
They ask SEI to delete their account. 

This looks like a case of the first.  The user had a single (or a couple?)  posts that are now deleted and they've deleted their own account.  It could also be the second, but that is less likely as there is typically a short waiting period when SEI deletes an account.