I live in Canada Vancouver where finding a muslim roommate/housemate is pretty hard. 
I am wondering if sharing the bathroom and kitchen with non muslim is permissible. As per sistani.org the sikhs and hindus are not tahir therefore them touching things with a wet hand (body) makes it impure. Is it also for Christians and Jews?

He considers Christians and Jews to be pure, so if they touch something with went hands, it does not become Najes. It’s permissible for you to have non-Muslim roommates, but if they make the bathroom najes or anywhere else, just make sure you purify your body/clothes before praying.