greek mythology is nothing else then an outdated religion. There is no difference between mythology and religion. So I would say the Christian mythology and the Islamic mythology are currently the most influential. Before that greek mythology and egypt mythology. The roman mythology was an offspring mythology kinda like old-new testament. In Southamerica ofcourse other mythologys prevailed. most Hip these days is the greek mythology

Christian

Abrahamic mythology is probably the most influential.

It simply supports your point. One is considerred myth, the other modern faith/religion even though they hold striking similarities.

Christian?

Edit: 

Considering it's still going strong and world leaders base their war declaration decisions on it still, it's obviously the most influential at the moment.

You realise that Greek/Roman/Norse mythologies are abandomed religions no one practises today ?

What stupidity? Christianity is a collection of myths, just like any religion. Not including it would be stupidity, and the only people who would object to such a thing would be people with an agenda, aiming to denigrate other belief systems, while glorifying christianity (have you become a fundementalist christian by chance?).

I've noticed that many people on here are using the 19th century definition of the term 'myth', as in a invented story part of a deceased belief system. Myths are actually explanations of the world, presented as being true. Myths are beliefs which people never question, and which fall appart if ever put under scrutiny. They're often used to justify social institutions. If anything, when you realzie that something is a 'myth' it ceases to be a myth.

Mythology isn't just limited to religion, as myths are present throughout culture. Als, mythology isn't dead. People today live myths, just as they did millennia ago, and thinks like pop culture make sure that they never die. Think of traditional gender roles. They're myths, beliefs that the overwhelming majority of people never question, yet when you do question them (like feminists have done), they simply fall appart. And think of all the social institutions that this myth supports. Likewise with myths regarding family or marriage. The ideea thats 'having kids is what you're suppose to do to be happy' is presented as one of the most 'common sense' ideeas out there. If you don't have kids, you're not complete as a human being. Of course, if you take into consideration the fact that some may not be ab le to afford raising a chuild, or may not have time, or may simply hate children, this myth is exposed for what it really is. But, due to the fact that it's so naturalized, will even be afraid to question it, and will feel like terrible human being for even having such (absolutely logical) thoughts.

Going back to why Christianity should be included, just think of all the cultural products influenced by Christian mythology. Think of authors like Steinbeck, or Tolkien. heck, even TV shows like Lost or Heroes are influenced by Christian mythology (the Heroes pilot episode was actually called Genesis, a reference to the christian creation myth). Or even animes, which are japanese cultural products.

Along with Greek mythology, Christian mythology is probably the most influential mythological system in contemporary society, and not including it in this discussion is just ignorant (the coming flame war is just a price you have to pay).

Good observation. It's as if people think that the ancient Greeks didn't believe in their own religions.

I think some posters are confusing religion and mythology and assuming it to be one in the same.

They are not the same. Mythology only deals with certain concepts, whereas religion is inclusive of mythology as well as other things liek morality etc.

Generally though a mythology goes with a religion, but one is not the same as the other.