There's a bit more nuance to deontology vs consequentialism in that you don't necessarily have to believe that there is a higher moral standard, more that there is an absolute one.
I edited myself down for the sake of the joke flow, and you caught some resulting bad grammar: that was supposed to be "higher power"
or "moral standard" that was outside of humanity, not necessarily
higher moral standard.
The implied argument being, you can't have an absolute moral standard arise from human reason, thought, or emotions; any human standard is necessarily limited, flawed, or subjective. You have to go to something outside of human creation to attain complete objectivity. So you're right, it doesn't have to be "higher" than a human standard, it simply has to be free of human construction to obtain something like an "absolute" standard.
The problems there are two-fold - a) consequentialism suffers from a pretty big epistemic gap because how are you supposed to know the future? A lot of the arguments in favor of utilitarianism and consequentialism assume knowledge that you're pretty unlikely to have - but b), assuming whatever's making the decision knows the future, then you can run into some pretty screwed up situations.
Consequentialism is like Soviet-style Communism: if you had perfect knowledge of every aspect of some decision, and perfect knowledge of the future ramifications, it's workable. If you don't, it's a practical disaster.
That's what makes them both so dangerously attractive, it's
theoretically the most objective way to do things. Big emphasis on the
theory part. Reality shows the necessary calculations are unworkable. I'd argue that, at the current state of human knowledge, we've shown that being able to make such calculations is
also theoretically impossible (for both consequentialism and Communism). But obviously there's disagreement with my conclusion there.
(I could spend a few paragraphs shitting on virtue ethics here. Maybe later. Usually when you want to figure out if you're trolling normies or philosophy nerds, you relabel that column as "Miscellaneous" and wait to see who gets mad.)