see these verses from the holy Quran.
verses 142 until 150 of chapter 2
say: The East and the West belong only to Allah; He guides whom
He likes to the right path.
And thus We have made you a medium [just] nation that you may be the
bearers of witness to the people and [that] the Messenger may be a bearer of
witness to you; and We did not make that which you would have to be the qiblah
but that We might distinguish him who follows the Messenger from him who turns
back upon his heels, and this was surely hard except for those whom Allah has
guided aright; and Allah was not going to make your faith to be fruitless; most
surely Allah is Affectionate, Merciful to the people.
Indeed We see the turning of your face to heaven, so We shall surely turn
you to a qiblah which you shall like; turn then your face towards the Sacred
Mosque, and wherever you are, turn your face towards it, and those who have been
given the Book most surely know that it is the truth from their Lord; and Allah
is not at all heedless of what they do.
And even if you bring to those who have been given the Book every sign they
would not follow your qiblah, nor can you be a follower of their qiblah, neither
are they the followers of each other's qiblah, and if you follow their desires
after the knowledge that has come to you, then you shall most surely be among
the unjust.
Those whom We have given the Book recognize him as they recognize their
sons, and a party of them most surely conceal the truth while they know [it].
The truth is from your Lord, therefore you should not be of the doubters.
And every one has a direction to which he should turn, therefore hasten to
[do] good works; wherever you are, Allah will bring you all together; surely
Allah has power over all things.
And from whatsoever place you come forth, turn your face towards the Sacred
Mosque; and surely it is the very truth from your Lord, and Allah is not at all
heedless of what you do.
And from whatsoever place you come forth, turn your face towards the Sacred
Mosque; and wherever you are turn your faces towards it, so that people shall
have no accusation against you, except such of them as are unjust; so do not
fear them, and fear Me, that I may complete My favor on you and that you may
walk on the right course.
also verses 96 and 97 of chapter 3
Most surely the first house appointed for men is the one at Bekka, blessed
and a guidance for the nations.
In it are clear signs, the standing place of Ibrahim, and whoever enters it
shall be secure, and pilgrimage to the House is incumbent upon men for the sake
of Allah, [upon] every one who is able to undertake the journey to it; and
whoever disbelieves, then surely Allah is Self-sufficient, above any need of the
worlds.
Why do you bow to it? Why is it the qibla? Why circle it during hajj/umrah? How is that not shirk?