Not just between religions, but within Christianity.
Not sure you have been reading my posts. Tolerance is one thing, but if you do have a strong Faith- although you can tolerate others, and respect them from a distance- it is very difficult to truly respect them AS EQUALS, of equal value. If you truly believe your Faith is THE ONE - respect comes in name only- as 'mistaken' or 'a bit strange' ... etc.
This is already so within Christianity, as per Jehovah Witnesses, Plymouth Brethren, or even Catholics and Protestants, and even between different denominations, and even in the CofE.
And with in mind the two examples (of so so many) given beforehand, in two separate schools, and the Vicar at my ACs school when they were very young. And so so many more.
When my parents got married, my mother a Protestant from a very Bourgeois background, divorced and with a child- married my father, from a staunch Catholic background- it was as if they were committing the worst sin- they were ostracised by both sides.