Scouts Canada is ‘almost’ all-inclusive. The only people excluded are athiests (and actually only athiests who fight against the requirement to believe there is something or someone higher/bigger than ourselves (even something like ‘nature’) This includes being co-ed.
Religious groups that sponsor a group are allowed to restrict the membership a bit more on a national level. So LDS (Mormon) groups, for example, are Male only (may have female leaders for cubs or 11 year old scouts.) I think religious groups could restrict it to members of their religion (all the LDS groups I’ve seen do NOT do that restriction…) I don’t know if they could do other forms of restriction – I haven’t heard anyone test it.
When I was a cub leader with the LDS group, we had quite a few kids from the neighbourhood of various religions. We opened with prayer (non religious cubs were allowed to just be quiet, or to step out of the room – their preference) There were no Sunday events (the local Klondike derby has Scouts do it on Saturday, Cubs on Sunday – but they allowed that cub pack to run on Saturday instead.) With the Scouts they don’t camp over Sunday with very very few exceptions (like a Jamboree) and don’t travel on Sunday for camps either.
We are now with a community group, so there are no prayers, although a grace song will be generally sung before meals at camps. So some stuff does occasionally happen on Sunday… But the scouting is much better in this group.
I do think that Scouts makes boys into great men (and girls into great women).