Well, if you consider Industrial to be heavier than Metallica (in a way, it is, but in other repects it isn't), then I can definitely suggest some. For the record, Industrial is the style that bands like Skinny Puppy, Stabbing Westward, Rammstein, Nine Inch Nails, Rob Zombie, Marilyn Manson, Front 242, Nitzer Ebb, etc. play (the actual sound of the music, not the lyrics).
There are four notable Christian Industrial bands that are fairly easy to find. Most of the others are very obscure, mainly because Industrial isn't one of the most popular styles of rock music (although definitely one of the best, IMO).
Mortal - This is the band that's credited in introducing Contemporary Christian Music to Industrial. They sound a great deal like a cross between Skinny Puppy and early Nine Inch Nails (i.e. "Head Like A Hole"). Their older albums can sometimes be found on Amazon, and their debut Lusis was their breakthrough (if I can recall, they did hit number one on the Christian Metal charts in 1991 with a song off of Lusis). Fathom and Wake, the last two albums before they broke up in 1995, are also supposed to be really good. Their newest album (they reformed in 2002), Nu-En-Jin, is still available from most music distributors.
Circle Of Dust - Circle Of Dust is mostly credited for bringing Industrial Metal into Christian music. They sound a lot like Stabbing Westward's second album (Wither, Blister, Burn, and Peel, which had the hit song "What Do I Have To Do?"), but with heavy Goth Rock influence as well. They appeared on a Steve Taylor tribute album (performing the song "Am I In Sync?"). The band broke up in the late 90s, launching two side projects, Klank and Celldweller. You can find them on some retail websites like Amazon.com.
Klank - Klank plays very heavy Industrial Metal, and emphasizes the Metal part more. They do have a few dancy tracks that could get played in clubs, but most of it is grinding guitars and heavy distortion and feedback, along with gutteral vocals. They do a cover of Van Halen's "I'll Wait" on a VH tribute album. Both of their albums are available on iTunes, as is the cover of "I'll Wait".
Celldweller - Celldweller is really just one person, Klay Scott, and still plays Industrial Metal, but emphasizes the synthesizers and dance beats over the guitars. One of their songs, "Switchback", is heard briefly in one of the Spiderman 2 trailers, just as Spidey is swinging between the gap in the semi truck. The album is available through most music distributors.