Wait, I thought that "alt-right" just consisted of about 10 000 guys on the Internet who didn't even agree on a coherent ideology? Or is it now a new short-hand for "racist sexist bigot neo-nazi"? I'm confused.
Alt-right's more or less just the more extreme chunks of the conservative movement. Neo-nazis, white supremacists, sovereign citizens, separatists, stuff like that on the furthest end, folks like limbaugh or, well, bannon, on the questionably more moderated end. There's not exactly a coherent
ideology but they tend to run more or less the same narratives on a lot of issues. The internet portion's honestly only sorta' a meaningful part of it. Talk radio and word of mouth/print media has been moving it along as a general thing for a long time. Though they're starting to converge a bit more in terms of impact, and they've been feeding off each other for a while now.
And eh, MSH, there's overlap in the fundie nutter/extreme evangelical area of the religious right. It's mostly just a catch-all for the parts of the right that even your average republican isn't entirely comfortable claiming as one of their own.