RE: Novel where Science/Modern Tech. vs Magic in Another fantasy world.

#4
Salvation war by stuart slade, just ask your best friend google and he'll get you pointed the right way.

its about a demonic army equipped and expecting a bronze age army to stand against them after God has declared all of humanity to die, the only problem for them is that they're invading in the twenty first century and tech has proven to be effective in killing demons. the story features the american military complex to detail and the troubles of waging a celestial war against hell.
They said the world is ending.
They are wrong. Its only changing.
https://i.imgur.com/LqcYAhwt.jpg