Is it true? This is related to religion?

No.

The kabah has been cleansed of all idols for a long time now.

The kabah is the holy mosque or masjid where Muslims pray and Muslims all over the world face it.

Before the kabah had been plagued by idols from the Pre-Islamic Arabs.

In the beginning of Islam Muslims were ordered to face it while praying. But they still had the images of the idols they used to worship.

So God weaned them and helped them by ordering them to pray instead in the direction of Jerusalem, the third holy city in Islam, towards the Al-Aqsa Mosque. By doing this they prayed still to God, but now their minds were being cleansed. They prayed without imagining something. So now that they were weaned from this habit, Allah ordered them to return facing the Kabah again.

Even though the Kab'ah had been cleansed of the idols, it was still in the minds of the new believers. So through God's wisdom He had helped the believers and now we all face the kabah to pray and go around it, or make tawwaf, during the pilgrimages.

But in no ways does this mean we pray to it. Muslims only pray to the One true God, Creator of the heavens and earth and all that inhabit it. The Most Wise, Most High.

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@Sunnyde_lite;

The stone that is in the Ka'bah was once whiter then milk and sent down from heaven. Over time it's become black from the sins of the sons of Adam.

And Muslims have no symbol for Islam. The crescent was only started by the Ottoman Empire and doesn't stand for Islam. The fact that Islam has no symbol is a symbol in and of itself.

Muslim men are not allowed to wear the color red or silk. Muslim women on the other hand are allowed to.

First mistake; Muhammad, peace and blessings be upon him, was already in Makkah.

Second; " ...In the beginning, the Makkan leaders did not care much about Muhammad [pbuh]and took no heed of his teachings. At first, they thought that Muhammad [pbuh] was merely a religious philosopher..." I don't know where you got your source of debates with the wise men.

http://www.witness-pioneer.org/vil/Books/SM_tsn/in...

It might be true, but the world will never know since no one is allowed in there. The stone in the Qaba is black, so is the Shivalingam (as black stone that symbolizes Shiva). Also, Muslims use a crescent moon for their religious symbol, Shiva always had a crescent moon tucked into his hair. Just some similarities between the two, not insinuating anything here ;)

But the mosque around the Qaba was once a temple, it was full of statues from the Hindu scriptures. When Mohammad came back to Mecca for the first time, he tried to defeat the wise men there through debate (but it didn't work). So Mohammad went back to Medina and came back with an army, he forcefully took Mecca and slaughtered the wise men. He defiled the temple and destroyed the beautiful images installed there. He then went on a conversion binge and converted all the Arab tribes living in the area.

There is a Muslim belief that they aren't supposed to wear saffron, this is because Mohammad didn't want his followers associated with Sanatana Dharma (or "Hinduism," saffron has historically and religously symbolised our culture).

There is proof that Mohammad had run into Sanatana Dharma before he came into power, and he did not like it. It makes sense because there's proof of Sanatana Dharma being present in the Mediterranean during Roman times, so why wouldn't it be right next door in Arabia 6 centuries later?

I have heard that before it was a Siva Temple,

I don't know for certain;

u asked this twice