Before I became Hindu, I did some rudimentary study of the Torah, but not all that in-depth. Most of it doesn't speak to me that much. The Gospel is quite good; in fact, many Hindus accept it. There's actually a book entitled "Sermon on the Mount According to Vedanta" written by a disciple of a disciple of Sri Ramakrishna. It's quite good. As for the Qur'an, I've read bits of it, and I like some parts of it, and others not so much. I love the Al Fatihah prayer, but the justice system outlined in it is so full of faults that it couldn't have come from an infallible God. Not to mention, I refuse to believe a God of Love would even allow an eternal hell to exist, let alone send people there for petty reasons.
So, I do know of them a little, and do intend to study them once I'm more grounded in Hinduism.
If you have any questions about Hinduism, just drop by the Hindu DIR and ask. Paramahamsa Yogananda and Satguru Sivaya Subramuniyaswami both have disciples here on this forum, so they can give you more information about them. As for Sri Ramakrishna, there's plenty of information about him online, but a good start to who he is would be that before he started teaching, he practiced many different religions, including Islam, for a while, and found that they all lead to the same thing.