I was born a Christian Scientist, went and studies as many religios traditions as possible in the time alloted. Then I read the Bhagavad-Gita and I was convinced that Lord Sri Krishna from 5,000 years ago is the Supreme Personality of Godhead. The main points are that we are spiritual beings having a physical experience. The spirit is eternal, blissful, and full of knowledge. We are supposed to love all living entities and try not to cause harm to any other life form. We believe in Karma so we have to be mindful of our thoughts, and actions. We also believe in reincarnation, this is how we handle our karma until we are ready to surrender to Krishna and return back home to the spiritual world.
There are four regulative principles that we are supposed to follow: no meat eating, no intoxication, no gambling, and no illicit sex (sex out of wedlock without the intention of procreating God conscious children).
We chant, feast, and dance to glorify Krishna at our programs so it really is a fun practice.