Well, let's do an experiment. If three creative works each incorporates a character based on one single traditional character, is the character "the same" in all three works?
Let's take a religious figure. Hercules, the son of the most high god. Here are three films, each of which features a character named Hercules. Each work has obviously drawn on the same body of myths, traditions and legends. Also, earlier works are available for authors of later works to draw upon as well.
A 1997 cartoon feature,
http://www.imdb.com/title/tt0119282/
A television series contemporary with the cartoon,
http://www.imdb.com/title/tt0111999/
A Handel oratorio, here in a 2005 production,
http://www.imdb.com/title/tt0456974/
Does the same character appear in all three works? No, of course not. Each author has selected some things from the common corpus, and left the rest. Each creator has added original matter to what was taken from the common source. Each author has allowed the genre (animation, serial, musical drama) to influence the selection and creation of material.
The result is three unqiue characters with the same name and many parallels, but there is no possibility, none whatsoever, of one charcater being mistaken for either of the others.
OK, now let's do YHWH-God-Allah.
YHWH is the the collective product of the Hebrew national imagination. Jesus is a (probable) historical character whose deification results in the Triune God, utterly unknown to the Hebrews, and utterly irrelevant to modern Jewish religion. Allah is the original and sole creation of Mohammed, based skettchily on both Hebrew and (mainly heretical) Christian sources, with many original elements and adaptations to the folklore of his people.
And Abraham? He worshipped the Canaanite God El, according to the Hebrew Bible (
Exodus 6: 2-3). Or Yahweh, since there supposed to be the same, or Allah, since they're supposed to be the same, or Jesus (Before Abraham was, I am), since they're supposed to be the same.
Finally, the same analysis can be run on Jesus. Is Jesus, the (probable) historical character, the same person as St Paul's Jesus? Nicene Christians say yes, Muslims say no. So much for the same God theory right there. Is either of those Jesuses the same as the Jehovah's Witnesses Jesus? That would be Archangel Michael to Nicenes. Are any of those Jesuses the Mormon Jesus? The Gnostic Jesus? Marcion's Jesus? The Nestorian Jesus?
Of course not.
Edited by eight bits, 21 June 2012 - 11:32 PM.