What meditation is all about is to aquire a state of open, nonjudgmental, and nondiscursive attention to the contents of consciousness, whether pleasant or unpleasant. Cultivating this quality of mind has been shown to modulate pain, mitigate anxiety and depression, improve cognitive function, and even produce changes in gray matter density in regions of the brain related to learning and memory, emotional regulation, and self awareness.
Besides of all that nice an reasonable but somewhat dry benefits meditation is the way to finally enjoy a mind that is undisturbed by worry, merely open like the sky, and effortlessly aware of the flow of experience in the present.
Meditation and religion
Meditation has a very long tradition in just about every religion, including Buddhism, Hinduism, Sufism and Christianity. If you feel comfortable with any of these you can practice meditation in that context – if not meditation will work equally fine for you because its independent of any believe system.
There are numerous obscure spiritual techniques out there, promising everything if you just believe in something someone else tells you. Meditation is the opposite of this. It is not about believing anything, but about finding out yourself what happens, if you stop the bad habit of thinking all the time.