No you may not take Saturdays off.
Seems logical to me.
When he was hired he should have said, "There's one thing I need. I cannot work Saturdays. I will work any other day you ask me to, but Saturdays are out due to my religion."
Had he done that, I suspect he would have won.
SCOTUS rules against religion
SCOTUS rules against religion
“Activism is a way for useless people to feel important, even if the consequences of their activism are counterproductive for those they claim to be helping and damaging to the fabric of society as a whole.” - Dr Thomas Sowell