Why are People Involved in Killing Each Other in the Name of God?

[Dr. Sheshadri Thiruvenkadam (Balaji) asked] 

Swami replied: The original founders of the religions were the human incarnations of the same God like Krishna, Jesus, Mohammed, Buddha etc. Every religion says that their God only created this entire earth or this entire humanity. Unfortunately, there is only one earth and this proves that there is only one God mentioned by all the religions. Since God is one and the same, there cannot be contradicting concepts between the religions. But we find some contradictions and people are divided based on these contradictions. This division is leading to quarrels and finally killing each other. These contradictions cannot be from God because there is only one God as said above. These contradictions were introduced into the religions by some misinterpretations of the followers only in the name of God. Hence, the killing is also done in the name of God only. Quran says that you should protect even the follower of other religion and convey the message of Allah to him. It is left to him to follow or not. Hiranyakashipu worshipped Lord Shiva and his son Prahlada worshipped Lord Vishnu. Lord Vishnu killed Hiranyakashipu not because he is worshipping Lord Shiva but because he tortured Prahlada to change his religion of worshipping Vishnu. In fact, Shiva is Vishnu (Shivashcha Naarayanah… Veda). The conclusion of this is that God will punish you if you torture the devotee of any religion obstructing the freedom of his religion. Prahlada did not force his father to worship Vishnu. The same God exists in different forms in different religions. Hinduism is a mini model of unity in diversity that should exist in the universe as universal spirituality.