The Golden Kingdom (a Christian WH40K fan faction)

For a while now, I have been trying to devise a way to incorporate my Christian faith into Warhammer 40K in the form of a faction. Now before anyone jumps on me about the lore changes that such a faction would have on the greater 40K universe, I understand & thus I have no qualms about treating this as a completely separate fan-universe that simply parallels the 40K narrative. I don’t exactly have encyclopedic knowledge of the 40K universe either & I might overlook certain aspects of it, but I would be happy to receive input about such things, including questions & suggestions about how this might interact with the cannon lore. I want this faction to be somewhat plausible, though of course my own head-cannon would say that everything they believe is true, the rest of the universe will  see them as delusional heretics. As always, I appreciate any positive feedback/criticism, I thank you for your time & God bless!