As someone said in a YouTube video, “the Internet is where religions come to die”. He is not too far from true. Numerous posts everyday in forums, imageboards and videos prove that. Also a number of internet memes has made mocking religion a phenomenon. Here are some examples:
The Flying Spaghetti Monster
The phenomenon of the Flying Spaghetti Monster began when a student, Bobby Henderson, was disappointed that intelligent design was to be used as an alternative to evolution in his university. So he came up with the FSM and from then on, thousands have been touched by his noodly appendage:
Invisible Pink Unicorn
She is both invisible and pink. How can this be? You can’t prove she is not and you also can’t prove she’s a female goddess. That proves that she’s real. The origin of the Invisible Pink Unicorn dates back to 1990, where a Usenet user participated in a channel called alt.atheism. He responded that no-one can’t prove that invisible pink unicorns don’t exist.
The Crocoduck
In March 2007, Kirk Cameron, came up with the idea of showing up in ABC’s Nightline show with Ray Comfort with a photo-shopped image of a crocodile-duck animal and called it crocoduck. The idea was basic:
Crocoduck is fake = evolution is fake
Kirk made a ridicule of himself on live TV and was begging for Internet attention and soon the crocoduck became an Internet Meme:
More info
For more information on internet memes related to religion, check out the Denouncing Religion entry on KnowYourMeme