Let us assume that the Hindu religion is absolutely the worst in the world. All its gods are pieces of potty. Hindus are most stupid people in the world.
Now Islam is said to be the only religion accepted by Allah. It is the last revelation from Allah to mankind. Muhammad was the final prophet, and an ideal human being that everyone should try to follow.
So we have to examine the Quran and Hadiths to find if this really is the case - if Islam fits in with our modern sensibilities. If it does, it is our duty to explain that to Hindus and others, and save them from their evil ways.
So read the Quran and Hadiths. Don't bother about gutter scriptures of Hinduism.