Blasphemy is showing disrespect towards a deity or other sacred object. (Saying "God sucks" would be considered blasphemy.)
Heresy is having a religious opinion or belief that goes against the common doctrine of your religion. (Saying "I think my neighbor Joshua is the second coming of Christ" would generally be considered heresy.)
You can be blasphemous without being heretical (e.g. "God sucks but the Bible is right"), heretical without being blasphemous (e.g. "my neighbor Josh, whom I love and respect, is the messiah"), or both (e.g. "my jerkface neighbor, whom I intend to fight behind Denny's, is secretly God").
ok a couple big takeaways from this. one, i think comparing The Weekend to the trinity might not be heresy OR blasphemy, therefore rendering that post purely educational.
second, i absolutely love the the idea that while it is obviously a sin to go around claiming your neighbor is the second coming of christ it’s TWO sins if you resent him for it