Turning the question “Is fire alive?” on its head, perhaps the better question is “Is life afire?” Life fundamentally involves oxidation, so perhaps one good way to deal with this issue is to categorize life as a kind of fire. Certainly this makes more sense than attempting to redefine life so broadly as to include things that just don’t seem alive.
That word “seem” is crucial to defining life, because some prefer a strictly categorized definition based on authority from afar (that “God” person-thingy) and these folks hate “seem-y” definitions. They feel it’s important to have clear-cut answers to murky questions. Indeed, I have found that “simplism” (the desire to resolve complex issues with simple rapid clarity; you heard it here first) is essentially synonymous with conservatism, at least with American conservatism.
But you’d have to be pretty far off the opposite end of that pool to really see fire as alive. So I says it ain’t. Instead, life is on fire. Paul Simon even says so (name the song and album for extra credit)