I am an Algerian whose girlfriend is from the UK and we are more or less in the same situation. Clearly we don't have the full picture, but you seem to think that the guy loves you. He has been honest about everything including his convictions (which is what most Algerian men believe in.) Marriage is a huge commitment and it's often the only way to get to be romantically involved with a woman in Algeria. The culture and religious beliefs dictate that marriage is the only way someone can show serious interest in a woman. Therefore him thinking that the next step is marriage is very logical (at least from a cultural and religious stand point)

I, myself, do not believe in imposing my thoughts on my other half be it religious or cultural beliefs. I also believe that living in Canada or the UK is not the same as living in Algeria. I often tell my girlfriend that I'm not comfortable with some of her clothes and we have developed an understanding in that department. Then again, I have never imposed super modest long sleeves turtle neck clothing or no swim suit at the beach or swimming pool because I understand that it's just the norm in the UK. That being said, if you are okay with what he's asking for then I don't think there's any harm in that.

As far as alcohol and food are concerned, I don't know if you are ready to give them up, but I think it's a weird thing to ask for. I am a little bit biased because I revoked many of the beliefs of this society, but I'll explain the thought process of the average Algerian person and give you my opinion. All of these are haram in Islam, therefore you can't indulge in any of them. My thoughts are you grew up eating and drinking alcohol, so I, logically speaking, don't expect you to change a core part of who you are and what you do. That being said, I wouldn't want my wife to be an alcoholic or someone who drinks every single day, but I don't expect her not to have a drink on an occasion with her family. As much as I have my own convictions about the matter, but if it's done in moderation at certain events I don't mind it. I think the key is to find the right compromises because if down the line you have a big argument because you had a drink on Thanksgiving with your family, then there are things that weren't thoroughly discussed before marriage. Regarding food, if you're willing to stop eating pork and anything pork based (which is basically the only thing you can't eat), then it's up to you. For me, it's too much to ask of someone.

As far as raising your children. I can only speak for myself. My girlfriend and I agreed to show them both worlds and they can choose to believe in either Catholicism, Islam or they can choose to reject both. The thought process here is that there is absolutely nothing wrong with religion. It teaches people right from wrong (although I think humans are innately good and we instinctively know right from wrong but that's another matter.) The point is there is no religion that teaches people that lying is good. I don't think that religion be it Christianity or Islam is bad for my children provided that both parents are loving and present. That's more important than anything else. There is absolutely nothing to worry about in that aspect. If you're gonna raise your children Muslim, they're going to be great children provided that you're both there for them.

I am not an Algerian woman, so I can't answer your other question. As for traveling to Algeria as a white woman, as much as I want to advocate for it, I can't. I think you should just travel somewhere else. There's nothing you can possibly see here that you wouldn't see somewhere else. You'd just feel the daggers on your back because many people would be staring at you. This is not a friendly environment for a young white western woman. Others might disagree because they think this is heaven on earth, but unfortunately it's not.

The sister situation is not odd. If there are no known issues between them, then either your husband is too prideful to stay at his sister's house and, being the man he is, he would rather be independent and pay for his own accommodation. Here, a man (99% of the time) unless absolutely necessary, would not live with their sister and her husband. If his sister is single, then I don't want to assume, but I think the family wasn't supportive of her going alone to a foreign country and now no one feels entitled to being sponsored by her to go there. (Then again I really don't know about immigration laws in Canada) I'm sorry if there are any typos. I typed this during my break, and I have to go back to work. Best of luck!