I don't know, what are you trying to achieve? Do you read the whole shabad and then explain your understanding? or do you just pick out lines that agree with your thoughts and manipulate them to suit your own end?
one more thing, what if your wrong? are you willing to take responsibility for your parents and friends acting on your readings? are you willing to take responsibility if such actions turn out bad? do you want that responsibility?
I sometimes ready Gurbani to my parents, and then we all have a good old discussion about it, but I would feel uncomfortable correcting my parents
John Lennon once said, 'whatever gets you through the night', well religion is a bit like that, it gets people through the night, tread very carefully before you start interrupting peoples way of dealing with things, and way of seeing things, especially older folk, how do you think someone approaching 80 is going to feel when the way that they have worshiped god all their life is exposed as a crock of shit, personally I would worry about yourself, and leave everyone else to themselves