I'm not that strong on this aspect of history, but it has always seemed to be an association rather than a sectarian divide. Even though it was well known Ever

I'm not that strong on this aspect of history, but it has always seemed to be an association rather than a sectarian divide. Even though it was well known Everton was the catholic club, plenty of catholics supported Liverpool from the beginning, for instance. Glasgow and surrounding areas seemed the strongest exception. You're right about sentiment in Liverpool though. That probably stems from the port and strong association as the point of migration leading to a large Irish community.