To be frank, the concept of a god is so badly defined as to be worthless. Kefka also defined himself as a god, and he was 'merely' incredibly powerful. If I recall the entirety of Sephy's plan, he wanted to become so powerful as to become nigh invulnerable, immortal, etc, in the classic, grecian understanding of what a god was.
There's a huge difference there. A god has complete power over life and death, and can understand the concept of infinity, as well as being invulnerable and immortal. Sephiroth may be able to get the power, but he's still got stats, and if it's got stats, it can be killed, which wouldn't make him a god.

As a general rule, they're also not particularly physically active, but I've known some exceptions. However, Sephiroth isn't a goth (as ill defined as the concept is), but a sadistic egomaniac of the grandest design.
Truth.

Well, the entire point was that his plan, were it successful, didn't need a living planet to stay around.
Exactly. The argument was if Meteor would destroy the world or not. Then the sudden change of topic. Hmmmmm.....is someone DODGING!!!!!!!

One Meteor Swarm perhaps, but definitely not one fireball.
True. I did exaggerate a little too much...