[Mick]

I doubt that it would be religious reasons because we've played both Notre Dame and Boston College — and probably SCU back in the day.

Yes, probably.  Actually, Stanford has played Santa Clara 35 times, more than any university except the original Pac-8 schools and San Jose State. And one more than against Notre Dame, which has played Stanford 34 times.  ASU has played Stanford 32 times and Arizona 31 times.

[Mick]

I doubt that it would be religious reasons because we've played both Notre Dame and Boston College — and probably SCU back in the day.

Yes, probably.  Actually, Stanford has played Santa Clara 35 times, more than any university except the original Pac-8 schools and San Jose State. And one more than against Notre Dame, which has played Stanford 34 times.  ASU has played Stanford 32 times and Arizona 31 times.