::::I have no personal problem with metalcore, nor do I think overlap in general is great enough to justify throwing out the whole thing. It's just that metalcore bands (even if you limit it to Christian music) are so diverse, and the term itself so broadly applicable, that virtually every entry would be repeated in at least one, maybe two other sections, something that wouldn't happen with extreme or alt metal bands. Very few bands would be unique to that section of the list. Also, as I pointed out above, it essentially already exists. To justify its existence here, there would have to be a significant amount of bands sourceable as just metalcore, and I don't know too many of those. 
 ::::Nevertheles, I'm open to trying it out as a compromise. So that would make it: 
 ::::*Early Christian metal bands 
 ::::*Glam metal/hard rock bands 
 ::::*Extreme metal bands 
 ::::*Progressive/experimental metal bands 
 ::::*Alternative, rap, and nu metal bands 
 ::::*Industrial metal bands (don't know how many there are, but it's not worth fighting over 
 ::::*Metalcore bands 
 ::::How's that?