Honestly? I just google the song title + tab when I'm looking. Christianguitar.org is nice but they have so many CCLI/DCMA notices, they almost always have to remove the music + lyrics off the site which makes the tabs useless.
Yeah, by using google you can usually find tab for most any song-old time country folk gospel tunes. . .tab for those is everywhere. I'd recommend "Flatpicking Guitar Magazine," if that's your style of music, if not-you'll find what you seek, if you look enough.