Wow! Kindergarden already? But isn't he only turning 4 in April? I thought that you had to be 5 to start kindergarden...
What happened to your home-schooling plans?
I guess that I am not really answering your questions.

I am just so excited to be online at the same time as you.
It's my biggest dilemma. Right now, he's totally immersed in a french pre-school. At first, he was dreading going, but it turns out that there is another boy who speaks english-only and they are joined at the hip. His teacher doesn't speak much english so I know that he is being exposed to french full time.
I think that I do not feel comfortable sending my kids to french school. I have a few reasons, one being the one you mentioned (my dh speaks french but went to english school his whole life, and I would probably be the one to help with homework and I am not french, although I can speak and write a little).
Also, it's a political thing here (what isn't

). I am not 100% sure, but I think that if I do enroll them in french school, then they will have to attend until college. The laws here are pretty strict; you can only send your children to english school if you have been educated in english schools in Canada (I think?). So, if I send them to french school, then that would be it...forever. Then my grandchildren, and so forth would have to go as well...talk about pressure.
All this to say that I think that our attitude right now (at least mine anyways, can't really speak for dh) is to send them to an english school, hopefully french immersion. I learned french in school and it wasn't french immersion; plus we live in a predominantly french neighbourhood; my inlaws are french...I think that they will learn it no matter what because we live in Quebec.
As for the religious schools...they don't exist here anymore. When I went to school, the school boards were either Catholic or Protestant, now they are French or English.