[DManA]

why it is called the ‘god’ particle.

Physicists have a weird sense of humor.

[bubman]

Why isn't it called the Allah particle?

Oh right because he doesn't f*en exist!!!

[Moonman62]

From Wiki:

The Higgs boson is often referred to as "the God particle" by the media, after the title of Leon Lederman's popular science book on particle physics, The God Particle: If the Universe Is the Answer, What Is the Question?

Lederman said he gave it the nickname "The God Particle" because the particle is "so central to the state of physics today, so crucial to our understanding of the structure of matter, yet so elusive," but jokingly added that a second reason was because "the publisher wouldn't let us call it the Goddamn Particle, though that might be a more appropriate title, given its villainous nature and the expense it is causing."

Physicists have a weird sense of humor.

Apparently so, at least in this case.