Brahmajala Sutta (Theravada)
In the second part, the Buddha explains the major beliefs of ascetics in India. He begins by saying, ""Monks, there are other things which are very deep (profound), very hard to understand, very difficult to perceive, so holy and sacred, unreached by means of mind, so subtle, that they are only to be understood and experienced by the wise. These things were perceived clearly, seen clearly and were discarded by the Tathagata, and by this act based on the truth that people praise and revered Tathagatha. What are those things?""
Am I a Hindu?
The book emphasizes that Hinduism is about the search of true knowledge, search of self, search of answers to all questions, at the end it also says that the day science will be able to answer all questions, all religion like Hinduism will cease to exist. The Book tries to answer questions by quoting similarities with other religion and without trying to show any other religion in a bad light, explains that how the broadness of Religion, which gives freedom to believe in god and at the same time be an atheist, pray the Idols or only the holy scriptures has led to many wrong beliefs about the religion.