Attributes.

Double wall and tower hit points.

+30% Priest rejuvenation rate.

+30% stone mining.

Long-Term Plans.

Stone Age.

No advantages in stone age. Just play hard to begin with. Also, try to start mining gold in the stone age since you got the +30% stone mining. You'll really need that later. :)

Tool Age.

Now, research towers and walls ASAP. They have double hit points, and if you're enemy is bold enough to attack them, they'll be in for a surprise! However, towers are no good even if they have a lot of hit points if your enemy can run away from them and still attack your villagers. Take advantage of the +30% stone mining and build additional towers and walls.

Bronze Age.

Everything is pretty much the same except that you should probably make some priests. Although the Babylonians are suited for defense, don't be afraid to build a massive army especially if it's a 1on1.

If you're thinking about archers, go for the Improved Bowmen and upgrade them to Composite Bowmen. You can also consider Chariot Archers if you're very skimpy on gold.

Remember to upgrade to Sentry Towers. It's important (duhhh!!)

Iron Age.

Upgrade your towers all the way to Ballista Towers!!!

If you find yourself defending succesfully but your army fails, then consider building a wonder. This will only work if the game is set to Standard Victory. You should only attempt to build a wonder after you set aside the space and built the necessary walls and towers to defend it. If you can keep it up for long enough, you'll win even if your enemy's huge army cannot destroy it.

Interaction with Other Tribes.

Strong Against :

Shang, Greek, Chosen.

Weak Against :

Sumerian, Hittite, Yamato.

Good Allies With :

Yamato, Minoan, Persian.

Overall.

Babylonians should be played if you plan on going 100% defensive especially in team games. The game creator must agree to play Standard Victory though.