Blasphemy is quite narrowly defined as insulting a deity or sacred objects. "Sinning" is not blasphemy, and homosexuality is not blasphemous unless you're invo

Blasphemy is quite narrowly defined as insulting a deity or sacred objects. "Sinning" is not blasphemy, and homosexuality is not blasphemous unless you're involving religious objects in sexual activities. For an example of actual blasphemy that riled up a lot of Christians in the US, see Serrano's Piss Christ. Although to the best of my knowledge nobody was killed because of it.