No, unless you only count the monotheistic religions as "major", which is very arrogant.
Other religions regard our behaviour as having its built-in consequences, as the Hindus in this thread have pointed out. And good behaviour certainly doesn't mean following "teachings" in our view.
Again, no. Only monotheists regard their gods as laying down laws. The rest of us believe that moral behaviour is behaviour that is essential if we are to flourish as human beings, and that is why the outlines are the same.
Indeed!
If I were asked for my personal views, I would deny heaven and hell and affirm that there are many possibilities after this life is over. I trust that when the time comes, someone like Persephone will assess me and select what will be in my best interest.