"And now verily We shall make you turn (in prayer) toward a Qibla which is dear to you. So turn your face toward the Inviolable Place of Worship (the Kaaba of Makkah)." (Al Baqarah 2:144)
Do Muslims worship the Kaaba by merely prostrating towards it?
Here are logical and simple facts refuting the claims of non-Muslims (mainly Islam-haters) that Muslims worship the "blackstone"!
1. It is a known fact to Muslims that we don't worship the Kaaba but only worship Allah (God) Ta'ala and Him alone. There is sufficient evidence to substantiate our stand and belief. Categorically, we explicitly deny worshipping the Kaaba nor the structure of the Kaaba. Hence, no worshipper (in his right frame of mind) can deny the thing he or she worships. In other words, Muslims deny worshipping the Kaaba and it is not a symbol of worship. The Kaaba is only a direction of worship. As can be seen in the verse provided above!
2. If at anytime the structure of the Kaaba is destroyed then too, it will be compulsory to perform salaat facing the direction of the Kaaba . Therefore, we can say without a shadow of doubt that Muslims do not worship its stone structure, otherwise by its destruction Salaat would immediately come to a temporary stop.
3. If a person decides to perform salaat on the roof of the Kaaba, the Salaat will be valid. Therefore had we worshipped the Kaaba then Salaat performed above it would be incorrect; because firstly, the thing worshipped must appear in front and secondly, it is utterly disrespectful and disgraceful to the thing worshipped by standing on top of it. Imagine anyone standing above their Creator and Maker of this universe.
Did you ask yourself at anytime, 'Why do we face one direction, and not many directions?'
Imagine if there was no one direction to face then everyone would have faced all directions which may have caused dissent and disunity in the heart of the Muslims. Therefore it was essential to provide a common direction for the Muslims throughout the world.
Why do we face toward the Kaaba in particular and not any other selected direction?
The secret in facing toward the direction of the Kaaba is the spirit of worship (Ibaadat), and contentment and serenity of the heart. Without this contentment there exist no spirit (rooh), which is the reason we are instructed to focus our sight on the place of prostration in Salaat so that we may be able to concentrate with our heart and soul entirely.