Alt-Right has nowhere to go but fascism, unless it puts spiritual values at the front and heart of the program.
I say spiritual values, because I don't see it as plausible that there can be any fully-Christian mass movement from where we are now - which is a situation in which public discourse does not admit the objective reality of anything at all outside the material realm - everything else is psychological, subjective, labile, and manipulable.
Thus a secular Alt-Right will inevitably be simply a different version of Leftism; a Leftism which has different materialist priorities, and panders to a different set of subjective emotions as a means to that end.
(Indeed, my impression is that most of the Alt-Right are exceptionally materialist, positivist, anti-altruistic and reductionist in their outlook - taking a positive delight in simplification of politics to their own power, security and well-being -- only to be shared, grudgingly, with those who directly assist this agenda.)
But materialism is a feeble, ineffectual motivator for Men. The most powerful motivator is an ideal; followed by fear and hatred - and, lacking any effective motivator and uniter, a secular Alt-Right will be forced to manufacture cohesion by
encouraging fear and hatred as an urgent priority to unify-around.
(I am assuming that nationalism was merely a temporary, post-religious phase - and will not work. If nationalism was going to work, it would long since have done so.)
Or else the Alt-Right will simply die - lacking any local and immediate reason for staying alive, The leaders will be bought-off or scared-off.
(As seems already to be happening - and there is a strong track record of secular Rightists selling-out at the first opportunity - And after all, why not? Expediency is their bottom-line.)
Nobody can compel a spiritual awakening - especially among ingrained and self-satisfied arch-Skeptics such as abound among the Alt-Right. I can only hope that they will leave-off the mass media addiction, and allow themselves to open-out and incrementally become aware of the wider world of reality beyond the immediacy of nuts and bolts and prideful self-seeking.