You can quickly finish this by first building up your economy and upgrade very fast
to the Mythic Age. Then upgrade as many as you can while at the same time building 
your army. After that destroy one temple near a town centre to the west and you will
get Meteor Power. I think your meat, wood and gold should be about 20,000 and your
favor is at 200. Then make a wonder and send all your villagers to build it. Then 
you will get the Gift from Zeus which will make Arkantos a super powerful Demi-God
(you will lose the rest of your God powers, but it's worth it). Then, using the God
Power on Arkantos, start your attack. But be warned a poseidon statue you must leave
some queued on your military. Then that's it you beaten the game congratulations.