The Churchill tank was a infantry support tank, it's heavy armor can withstand lots of punishment, and since it's role was infantry support, it didn't have great agility and speed.
The Churchill have huge amount of health and armor. Weak firepower and speed. This type of tank is described as an iceberg, slow and steady, not deadly, but near invincible. It's front armor is sturdy enough to bounce off a Tiger II's 88mm.
The Churchill is a good tank for noobs to grind points. Use Facebook logging feature to unlock it and then play king of the hill, hold the hill and get domination points, which can be used to upgrade or unlock tank.