Re: Hinduism and caste...
Here are the words from the last sermon of Prophet Mhammad(PBUH) about racism......
O people, Remember that your Lord is One. An Arab has no superiority over a non-Arab nor a non-Arab has any superiority over an Arab; also a black has no superiority over white, nor a white has any superiority over black, except by piety and good action (Taqwa). Indeed the best among you is the one with the best character (Taqwa). Listen to me. Did I convey this to you properly? People responded, Yes. O messenger of God, The Prophet then said, then each one of you who is there must convey this to everyone not present.
Excerpt from the Prophet's Last Sermon as in Baihiqi