You're fucking high if you think they wouldn't. I don't know if you noticed but Underoath did just that today with They're Only Chasing Safety and the two bands share a ton of fans. Thats without mentioning the fact that. simply put, Christian music sells in this country. I think it may have something to do with that little something called Middle America. The band have broke the top 30 on the Billboard top 200 in a day and age when music doesn't sell. They apsolutely would have sold 500k if not for piracy and they would have done it much quicker.
It took UnderOath almost 7 years to sell 500,000 copies of TOCS. Impressive, but I'd also argue that UO are a lot more accessible than Norma Jean. Middle America isn't buying Norma Jean records; they're buying Lady Gaga records and Drake records. Christian music might sell, but Christian metalcore is a little different. In the current Top 25 Billboard records for Christian music, not a single one is a metal band.
sold 16,000 copies in its first week to open at #29 on the Billboard 200.
sold 21,000 copies first week.
sold 19,000 copies in its first week, good enough to open at #64.
sold a whopping 9,800
copies first week to open at #45.
Blabbermouth posted at the beginning of 2010 that Norma Jean had sold a combined 360,000 records. I've never downloaded a Norma Jean song, and the only records I -knew- they put out was Bless The Martyr and O' God. It's a combination of poor marketing, a niche genre of music, and an industry that has a thousand bands that sound exactly alike. If you put a Norma Jean song up against twenty other bands with logos like this:
I honestly doubt 10 out of a 1000 people could pick out "Yep, that one's Norma Jean, alright."