We all have our unique religious journey in life. I firmly believe God cares MOST about how well we treat other people. Whether we affiliate or attend a specific religion, whether Christian, Muslim, Buddhist etc. A very kind, moral, nonreligious person, might have a better chance at the celestial kingdom (with afterlife exposure to the LDS per LDS doctrine) than any of us. So let's only concern ourselves with our own salvation and not get sad over someone else's potential afterlife. Every LDS person has a different version of what the afterlife will look like anyway. Nobody really knows the answer until we get there. Let's just do our best to show our love to everyone around us.