Just a quick glance at things, Maximus needs a socket desperately. 10% Damage on it does very little since it still only applies to the base damage of the weapon and not any of the +X-Y Elemental Damage. Your Shield offers no Crit Chance and it is one of the best sources of it for a Crusader. You have a lot of VIT in slots where you'd rather have STR/All Resist. I'd put a Diamond in your Helm over the Amethyst as well since CDR will do quite a bit for your build.
As for the build, don't know why you have two spenders. And, despite the fact it has no Fire rune, I'd probably still run Condemn since it is a lot of free damage and the Vacuum is nice CC / grouping. Besides, you have +Condemn gear. Divine Fortress is superior to Insurmountable as well in terms of total mitigation and not much reason to be running Blunt here over Renewal (or Wrathful). And, despite the Fire build, Rally is still better than Firestarter.
Thanks for the advice, I've rerolled the Maximus about 15 times or so with no luck on the socket and every time I have the souls and other mats to reroll any leg I try again. I'll get it soon I'm sure. Thanks for all the other advice, I'll make what changes I'm able to right now and hope for the RNGesus to give some stuff with more Str or sockets for AR over vitality, I figured my health was way too high. Would you say Sweep with fire rune or blessed hammer with fire run is better as a spender? I like hammers typically, but I thought I read on here that the fire run was bugged for it lowering the damage significantly.