The premise is sort of enticing as a writer, right? It's 1990 and in Ireland you got Christian sects killing each other in the streets. What if Ireland's well documented Pagan gods rose again in the wake of this disarray?
That's a cool thought! But then you get sort of into the mess of figuring out what that looks like as a fantasy novel, and it seems to me you gotta come down hard on someone's religion to have it make a degree of sense. And well, Cromm kind of plays both sides. Pagan gods are real and full of magic and power, seemingly undermining the core tenets of Christianity, but also Christianity is real and its powers (and corresponding magic artifacts) can crush the powers of the evil Cromm and his minions. St. Patrick is there and he's the real deal, but so are the druids of Danu. It ultimately makes for a somewhat unsatisfying execution of an interesting premise.
Thankfully Cromm doesn't go too hard into "Jesus is the answer" territory. The story ultimately plays out as a journey of discovery for our main character, Colin. And yeah, Colin's a lot. He's the kind of overly smarmy male protagonist that's suppose to be charmingly plucky but frequently gets obnoxious, particularly in his interaction with Megan, (co-hero/love interest/Irish native). However, I do think it pulls it all together in the exciting Crommclusion, where it's not really any religion that drives Colin to become the hero, but his own self actualization. And in turn you get why someone like Megan would maybe come around on the annoying American. It's still boilerplate kind of stuff, but it's handled well enough.
Speaking of well enough, Flint's writing is pretty solid. Pace was consistently good, and his temporal jumps were pretty good. I especially liked how he was able to disorient the reader with the jumps, taking a few seconds for it to click whether you're in the past or present. Really conveyed Colin's own confusion pretty well. Much of the action left me genuinely excited.
PUN INCOMING. Is Cromm essential fantasy? Maybe not, but I liked it. Picked it up used on a whim because it was called Cromm, and it delivered the goods. All in all, a perfectly Crommulent fantasy novel.