There are some valid and invalid points from both sides. Muslims say non-muslims are not allowed or its not sin to point your leg at mecca but at that time it wasn't impossible to enter. They also label Guru as muslim which isn't true because his successor would have known if he became a muslim. Guru did went to mecca and had conversations with qazis. However turning mecca or doing miracles in bagdhad consist more moral & spritual lessons than it being real. From sikh side the problem lies with the wrong translations. Bhai Gurdas Vaaran - Var 1 - Pauri 32 ਜੀਵਣਿ ਮਾਰੀ ਲਤਿ ਦੀ ਕੇਹੜਾ ਸੁਤਾ ਕੁਫਰ ਕੁਫਾਰੀ। the qazi named Jivan kicked him and asked who was this infidel enacting blasphemy. Bhai Gurdas Vaaran - Var 1 - Pauri 32 ਟੰਗੋਂ ਪਕੜਿ ਘਸੀਟਿਆ ਫਿਰਿਆ ਮਕਾ ਕਲਾ ਦਿਖਾਰੀ। Catching hold of the legs he lynched (Baba Nanak) and lo and behold the miracle, the whole of Mecca seemed to be revolving. Bhai Gurdas Vaaran - Var 1 - Pauri 34 ਧਰੀ ਨੀਸਾਣੀ ਕਉਸ ਦੀ ਮਕੇ ਅੰਦਰਿ ਪੂਜ ਕਰਾਈ। Wooden sandal (of Baba Nanak ) was kept as a memory and he was woshipped in Mecca. My understanding- A qazi named jivan is mentioned. However it is an indian name, an arabian then a muslim qazi then around 400 years ago having such name is not possible. According to Mahankosh, an encyclopedia of sikh scholar Kahn singh Nabha, jivan means force (p1734). According to sakhiyan (stories of Gurus) his name was Rukan-ud-din. When Guru turned his feet towards mecca, qazi used some force to kick, grabbed his feet & dragged him. Guru rejected directional prayers which 'turned mecca' because he had a different belief but he was holy men which made qazis respect him. Mind is also called mecca in sikh terminology (Page 1158). Another point is that Guru's sandals were kept there and Guru was worshipped, anyone familiar with mecca's history would know that its impossible. Qazis came to discuss religion & the Guru said how claiming to be religious is not enough, without good deeds everything is useless and answered their other questions. Guru gave them knowledge which they used during prayers at mecca. This knowledge/symbol is wrongly translated as sandals and their prayers as worshipping Guru. There are many other reasons of this being wrong such as SGGS rejecting supernatural powers as useful or Sikh Gurus not showing powers to Hindu Siddhas but proving them wrong with truth alone. This is a logical and realistic approach however if Prophet Mohammad can split moon in half, Guru Nanak can also turn mecca.