Re:Their conclusion is so bad it's just plain sill (Score 1)

(A person who keeps the 10 Commandments, for instance, cannot be a hindu or a buddist, since the first commandment rules out worshipping any other gods, and those religions are polytheistic.)

Incorrect, at least where Buddhism is concerned. Buddhism is actually non-theistic. While I'm an athiest Buddhist, I know of several people who are either Christians or Jews who also are Buddhist practicioners. One is Father Robert Kennedy, who is both a Zen sensei and a Roman Catholic priest. Another is Sylvia Boorstein, who wrote a book about being a Buddhist and an observant Jew titled "Funny, You Don't Look Buddhist".