How do you convert a man, By In Islam by circumcision isn't it, So does Jews they also circumcise,some christians also do. It is just a farce conversion means nothing it is what a person believes,is what matter. bowing in front of god is no bad thing but is dignified that the person bowing is at his mercy Islam or no Islam. There is no way one can tell what is in the mind of the person he/she could be in masjid praying in a Hindu,Sikh or Christian way can any one tell. So who cares. he is a Sikh and will stay Sikh Mullahs can say what they like.