If you have a girlfriend, a good way that's worked for a lot of my friends is to introduce her to everyone. Just saying "so and so/guys, this is my girlfriend X" means you've come out without having to say "I'm gay" which can be awkward, and eases people into the idea. And you've introduced your girlfriend, too, so you kill two birds with one stone.
If they are not crazy religious just bring them together as a group and tell them. Just be honest! This is how I wish I would have come out. But all of my family is crazy religious so when rumors started going around it was a mess! or bake a cake and write surprise I'm gay on it!