Religion can be a source of both great hindrance, help, harm and happiness, depending entirely on the situation and religion in question, simply because of the utter sway it has on the human psyche. As the universe on a whole proves to be larger, bigger, and less comprehensible as the years and decades go by, many wish to feel to be a part of a larger group, where comfort and familiarity, as well as easy 'rulebook' to life can be a great pull. Not only does that person follow that rulebook, but so does (supposedly) everyone else in that group. Humans are cliquish by nature. It's perfectly natural, and harmless, in and of itself. It's only when you start to run into politics that it starts getting iffy--but that's natural and unavoidable as well, even in small groups.
Looking at the big 5 (Christianity, Judaism, Islamic, Hinduism, and Buddhism) I don't believe they are harmful unless put in the wrong hands. If a government runs with religion, instead of being separate from it like a good government should; it can and will use religion to scare and govern its people. Its just like you can have good governments and bad governments. It all depends on who it is that is running it during the time.
no offence to anyone who is not chrstian or anything but there are millions of religions in the world (hyperbole) that require killing and warfare so it can be harmful. plus differnences in religion can cause conflict which is harmful. but all in all i still am going to continue to believ in christ i don't care if teh whol;e world tries to kill me. Jesus is lord and savior.
It doesn't matter if someone is religious or not, we all need to employ the rules of basic human decency and courtesy, every human deserves to be treated with dignity and respect... If we all lived by that, then there would be no hatred, no violence...