The Hindu Scriptures also preached "ONE GOD"

Hinduism, as most Hindus would say, is not a religion but a "Dharma" and a Culture. The Vedas, the Upanishads, the Puranas, the Brahmanas Granth are considered to be the holy scriptures, most sacred being the Vedas. Also there is the Bhagavada Gita, the Mahabharata and the Ramanayan. 

The degeneration of any society starts with becoming heedless to the guidance of God and falling prey to our own whims and desires. This eventually may lead to the degeneration of the concept of God itself. The worship of innumerable Gods in Hindu society is a degeneration of the message of God and in stark contrast to the oneness of God preached in the Hindu Holy Scriptures Vedas and Upanishads. A few examples from these scriptures reveal that they also preach Oneness of God, which is exactly the same truth which was conveyed by God through His final messenger Muhammad (There is no god, but God).

• "There is only one God, worship Him" (Rig Veda, Vol. 6, Hymn 45 vs 16 )
• "Do not worship any one beside Him" (Rig Veda Bk. 8, Hymn 1, Vs 1)
• "God is only one, - not a second"- (Chandogya Upanishad Ch. 6, Section 2, verse 1).
• "na tasya pratima asti
  "There is no image of Him." [Yajurveda 32:3]