I am going to close this thread in a minute. Our goal is to promote Islamic unity and this can very fast develop into a sectarian issue, which divides and does not unite.
Unless we have a valid reason to doubt that a person is Muslim, it is best we accept them as being Muslim, unless we know different.
We should not view anybody as being sunni, sufi, shi'i etc. We are one Ummah and there should not be any title in front of Muslim