Is blasphemous Music ok?

Indeed, in both cases it was the oppression (Catholicism and slavery) that sparked the creative spirit. Music, or more properly song, has always been a source of hope for the oppressed.

Given the strong influence of the Catholic Church on the make-up of the current US Supreme Court,  one finds Tim Minchin's  "Pope Song" increasingly relevant:

it's creepy and very sad to watch your reasoning about a "movie" that has never actually been watched ...

How do I know this? - I traveled a lot - visited other countries and can compare.

Imagine that you grew up and formed in Catholicism or Protestantism ... you have a picture of the world - you are used to it ... suddenly some Sergio appears and tells you - you guys are not just mistaken, you were deceived by clever PEOPLE - you are all life went the other way! ...
Your eyes are filled with blood, you start arguing, you are convinced that you are right, and I am a heretic ... you are scared and you do not want to change anything.

I'm not better than you - I just know the real state of affairs ... Can I change something? - there are no people in the life of the broad masses (this is a very big process), but for some individual people (a clean slate), my information will become living water! - an indication in which direction to dig in search of treasure.

As for blasphemers, blasphemers, comedians / atheists, shockers in music (actually not only in it):

there are two groups of people - in the first, those who do not understand anything about this, have no experience (and therefore are not afraid to lose), fools, those who have no talent are trying to attract attention to themselves ...
the second group - everything is much worse ... here are those who understand everything perfectly and deliberately crap. These people are seriously ill - they are physically attracted to evil. They are aware of their addiction, but defiantly refuse to change (it's kind of like a severe form of heroin addiction). They behave within the bounds of legal law, but this does not mean anything - this is just a way to avoid responsibility. Their goal is to make you feel bad... they don't care about you. (but they themselves enjoy it). You need to be able to notice and avoid such people! 

As safe as it is to say that without slavery, the blues genre might not have existed. 

Is it safe to say-Without religion, most  genres of the last couple centuries wouldn’t exist?

There is a guy who posts amazing videos on YouTube, calling himself The Jazz Shepherd (real name Dan something). In his deep discussions about Jazz music (he is a good friend of Stereophile reviewer Ken Micallef, himself a serious Jazz fiend) he includes the context of the racism the black Jazz artists faced in the U.S.A. as they were pioneering what he (and others) calls the only art form that America can claim as its own.

I think that may be an overstatement; what about Gospel, Blues, and Country & Western? Sure, Ireland, Scotland, and England had a long Folk tradition---the basis for Folk, Hillbilly, Bluegrass, etc., but it sure underwent change, invention, and development once imported into the U.S.A. And Blues was created as a form of expression and release by the 19th and 20th century American slaves and their descendants.

Speaking of American blacks, and Gospel music: in the black community playing anything other than Gospel was long considered depraved, and strongly frowned upon. Singers like Sam Cooke were denounced when they crossed over from the religious market to the secular. 1950’s Rock ’n’ Rollers Little Richard and Jerry Lee Lewis struggled with their religious beliefs and faith conflicting with their secular music. Little Richard quit the music business in the early-60’s, returning to the Church as a Baptist preacher. Jerry Lee, after being banned for marrying his 15-year old second cousin, created a new career n Country & Western. Apparently marrying a 15-year old relative was not so unusual in the South. ;-)

@bdp24 I was thinking about best microbrew, but sure politics works too. ;-)

In all seriousness, has there ever been more political music than the blues? It's an art form which developed in response to oppression.

On person's blasphemy is another person's anthem.

"Big Muddy" - Pete Seeger

"For What it's Worth" - Buffalo Springfield

@hilde45: Like, for instance, politics? ;-)

Music taking on religion is much more easily tolerated than music taking on other topics, in my experience. 

Perhaps just a matter of semantics, these days it’s not the music which may be blasphemous, but rather the lyrics.

But back when the Catholic Church ruled the Western world, the use of the tritone---then referred to as "the Devil’s interval" was forboden. It was considered "Diabolus in Musica" ("The Devil in Music" in English), and it’s use could result in one being burned at the stake. Ah, the good ’ol Catholic Church.

Tony Iommi was free to employ the tritone, and did so in Black Sabbath’s self-titled song on their debut album. By then Hendrix had already done so in "Purple Haze".

My favorite invocation of God’s name in music is in the great Country song "God May Forgive You But I Won’t", written by the team of Harlan Howard and Bobby Braddock. I first heard it by Iris Dement, then Rosie Flores.

The cannons in the 1812 Overture are acceptable, but otherwise I prefer to keep such to a minimum.

DeKay

you mean like "blasphemous rumors" by Depeche Mode?

It's the best kind. Bring on the blasphemy!!!! 👍

Depends if it's recorded in digital or analog.

I'm in America.  It is ok for you.