To the islamic people do you have proof?

A religion doesn't have to be "real" for someone to believe in. Its their morals and ways of life. Im not islamic but my boyfriend is and I have known and got close to their family for two years now. All that matters is that their religion isn't a bad one and teaches you about the same thing like every other religion. If your asking this cause you think they are all bad people or whatever that has nothing to do with Islam religion those are shi'ites.