I’m in Canada
(You’ll notice that this is the same as the post about the USA. EXMNA are North America focused, we swear we’re not confusing you with Americas! You’re too nice 😉
By far and by large, the best community to go to in Canada is EXMNA, which started off Reddit (just like the London/UK communities). They have two sides to them, an outward facing outreach/activism side and the original inward facing community.
If you want to join, either email EXMNA at community@exmna.org or contact the interfaithless team at community@faithtofaithless.com.