BS was great. I am a fan. So, not knocking the band in anyway shape or form. I don't know how old you are but I am older to toward certified old.
Saying BS invented metal is similar to saying the Beatles invented rock music. Neither are true.
Rock was created from the blues and some of the African American country/blues/folk, while European folk from Woody Guthrie among others joined and they slowly formed a pre-rock sort of sounds (not really, but there was the beginnings. Then Sister Rosetta Tharp was playing the first sounds of rock in 1930s and 1940s. Then Fats Domino, Chuck Berry, Little Richard really made it what has influenced everyone in rock music for the next 70 years.
But, you may not know that rock died in the late 50s and crooners like Perry Como and Paul Anka and Pat Boone took over. The Beatles then brough American rock back to the Americans and all of Europe/Asia/Oceana etc.
It was Cream, The Who, Zeppelin, The Beatles who were creating the first inklings of metal before BS.
BS created an awesome sound, identified clearly as BS, but did not invent metal, certainly not the only band credited with doing so. Also, the semi-religious, and devil-like schtick was a BS thing, not a metal thing.
And at the end of the day, it is all roughly rock music, with beleive it or not classical sensibilities, very European-like. You can take many of the great metal songs and turn them into classical. This is already often done with symphonies playing Metallica melodies....