what do you think raziel would look like if he had not been cast into the abyss?? I think he would have evolved into a giant bat like creature.

Yes that is extremly possible, because all of his brethern devolved into what there abilites we're like.

Melchiah - Pass through material and spectrial realm (turned into demonic slug that could survive in the spectrial realm)

Zephon - Was able to climb walls (turned into a giant spider monster that was strangly like the Alien Queen from Aliens)

Rahab - Could swim under water (turned into a fish type demon that looks alot like a merman)

Dumah - Could use small telekenisis skill but was extremly strong (turned into a giant rock demon strangly his childer were like an Alien from the Alien Quadlogy cause of there other mouth inside there own)

Turel - Had massive telekenisis abilities (turned into a giant dog like creature with massive ears and great smell, from what i believe he had bad eyesight and used hearing and smell to kill his victoms, its not really understood why he turned into that creature)

Raziel - Grew bat like wing that was nothing like the Ancient vampires (So he would not have turned blue like the Ancients like so many other people think he would have most likely turned into a giant bat creature or turned into a next kain only with wings)

But dont forget they all chose to turn into what the did they were not just like that Kain gave them a choice and they were all power hungery.