A wonderful critique of Christianity written by a learned Hindu, Chattampi Swamigal:
http://bharateeya.wordpress.com/2009/08/05/kristumata-chedanam-chattampi-swamikal-english-translation/
After reading this critique, so filled with logic and excellent reasoning, Christianity no longer seems like a sane religion to me. It is filled with such illogical concepts, that every paragraph of this book made me laugh out loud!
Hindus are said to be very tolerant and respectful towards other faiths. We don't attack them at all. However, when they attack Hinduism we also don't defend ourselves. Such losers we are!
A real and sincere Hindu will always defend his/her Sanatana Dharma. On of our primary duties is to speak the truth. When the truth is being attacked and falsified by other faiths, it is our duty to defend that truth and speak the truth always. That is what Chattampi Swamikal did in this book of Kristumata Chedanam (literally means "Demolishing Christianity"). A sincere Hindu knows that Sanatana Dharma always existed even before the Vedas were revealed to humankind. Just like how gravity always existed, even before its discovery by Isaac Newton.
Be equipped with knowledge! Don't remain ignorant!