Sorry if i haven't been asking in a respectful manner, i been trying. Apologies
Surely if Sikhism is for all mankind then it is for muslims too :?
See you have a common misconception. Muslims have 3 types of prayers. Theres the formal prayer where we prostrate etc 5 times a day. Now that is a command from God to pray 5 times a day, and since most likely most muslims will be praying he has ordained that wer have a common direction to pray in, it is a Kiblah- a direction. Even if somehow God forbid it was blown up or something, we would still be praying in that direction. People in mecca in the msoque around Kabah sometimes pray on the top floor where it is above Kabah, so they aren't even looking at it, but they are praying in that direction for unity since everyone else also is and simply because God has ordered nus to do it. If God was to order us to do otherwise we would pray in another direction. In fact Muslims at the beginning used to pray to Musjid Al Aqsa in Jerusalem, all of them, as it was a direction for that time and for purposes of unity they all had a common direction to face. It later got abbrogated anmd now they all face Mecca
Now we have two other forms of worship that we havent been commanded to do by God at all. And nowhere does it say for them that you have to face Kabah. These two other forms of worship are Dua and Dhikr. In ours Duas we just pray directly to God in our own language raising our hands up. In Dhikr of Allah we just praise God continuously. Now surely if Kabah was the residing place of God we would also have to face Kabah for that. But since its not obligatory to do these prayers, its unlilely others will be doing them same time as you so unity doesn't exist so no need to pray in that direction
Now back to your point about Guru Nanek. No man in his right mind would have said God lives in kabah. Only children at a youbng age believe that. Even muslims with the lowest IQs today will know God doesn't physically live there. Now what i think happened was the Arabs got offended by Nanak for pointing his feet towards the Kabah. In arab culture even today its offensive and disrespectful to point your feet at someone. And since we consider the Kabah to be holy its disliked to point our feet at it.
Now how about the SGGS. You put that at a high place don't you. Why don't you put it on the floor? Does God reside there? Of course not, but yet you still treat it with respect and have it at a high place