The kaaba is the Qibla i.e.the direction Muslims face during their prayers. It is important to note that though Muslims face Kaaba during prayers, they do not worship the Kaaba. Muslim worship and bow to none but Allah.
It is mentioned in Surah Baqarah:
“ We see the turning of thy face (for guidance) to the heavens: now shall We turn thee to a Qiblah that shall please thee. Turn then thy face in the direction of the Sacred Mosque: wherever ye are, turn your faces in that direction.”
[Al-Baqarah 2 :144]
For instance, if Muslims want to offer Salaah (prayer), it is possible that some may wish to face south. In order to unite Muslims in the worship of the One True Good, Muslims, wherever they may be, are asked to face in only one direction i.e. toward the Kaaba. If some Muslims live towards the west of the Kaaba they face the east. Similarly if they live towards the east of the Kaaba they face the west.
2. Kaaba is at the Centre of The World Map
When the Muslims go to al-masjid al-Haram in Makkah, they perform tawaf or circumambulation around the Kaaba. This act symbolizes the belief and worship of One God, since, just as every circle has one centre, so also there is only one Allah (swt) worthy of worship.
4. Hadis of Umar (may Allah be please with him).
At the same time of the Prophet, people even stood on the Kaaba and gave the ‘adhaan’ or call to prayer. One may ask those who allege that Muslims worship the Kaaba; which idol worshipper stands on the idol he worships?