Controversial opinion, but I dont think genuine sectarianism is actually a problem in Scotland, its a Rangers-Celtic thing that crosses the line of acceptable rivalry but isnt actually anything to do with religion per se.
Both sides of my family are Catholic. Mums side are mostly Rangers (most dont give a f**k about football tbf), dads side is Thistle. Never once had any anti-catholic or sectarian bile thrown my/their way.
The stuff both halves hit out with is unacceptable, no question. But ive never believed its routed in genuine sectarianism or religious intolerance, just anti Celtic/Rangers sentiment using religion as a medium.
Maybe just my experience though.