[Cipater]

No, I am not muslim.

Every single muslim, whether devout, practicing, lapsed or whatever, knows whether they are/were Sunni or Shia. They are literally born into it. It determines who is seen as the authority in matters of their faith, the way they pray, the sites they consider holy, the religious days they observe. Even Ramadan starts and ends on different days depending on which you are.

It's such a fundamental thing that I question whether you have any idea about what you're saying here.

[Marsymars]

I don't know much about Islam, but what's being described isn't uncommon for lapsed Christians. I know plenty of people in my orbit (including me) who went to mass on Christmas Eve and Easter as children, but literally wouldn't be able to answer if the curch they went to was Catholic or Protestant.