Nathaniel's question has got me in a tag maintenance mood. :)
One thing I noticed is that the tags for the gospel writers are inconsistent. We current have:
I would like to make the usage consistent, how should this be done?
I agree with your answer for the most part, but it's basically the status quo anyway. Some questions were just mistagged, and I've retagged the john and apostle-john questions to john-apostle, since he's the one they were about. I've also submitted a tag wiki to make matthew's scope explicit.
Here's where I have minor disagreements with your answer:
john should be blacklisted, since it's ambiguous: questions should use john-apostle for the gospel writer, or john-the-baptist for the other major John.
For the most part, the convention is that the Bible book "Foo" will be tagged as foo, and sometimes given synonyms foo-book and book-of-foo. So jude fits the convention. The only tags about books of the Bible that don't fit that convention are book-of-james (3 questions) and book-of-judges (6 questions) and the four gospels. I don't think those exceptions are worth our time to "fix" either, but if you want to fix the James and Judges questions, have at it.
I suggest that matthew, mark (if the need ever arises), luke, and john should be the tags for the gospel writers. The tags apostle-john and john-apostle should thus be made synonyms of john. Questions that are not about the person should be removed from matthew and john.
There are two other NT books this could apply to, James and Jude. We currently have book-of-james and jude. For consistency, I feel jude should be renamed book-of-jude.
