God himself

last time i remember blasphemy is when you claim to be God or when you mock him or smth

the problem is how subjective it is

elaborate

my mom will call a lot of things I say relating to God “blasphemous” even if my point isn’t to be derogatory

im going by the definition of it so i dont think your mom's opinion on it changes what blasphemy is
if you said "oh my god" it can be labeled as such under certain contexts, especially if intended to be derogatory

Also when you talk about him falsely