Actually, if there were no God, the world would likely be exactly like it is right now.
There are four scenarios here as far as Christians are involved:
Scenarion 1, God exists and is the Christian concept. All the Christians are right, all the non-Christians are misled, and all the atheists are deluded fools.
Scenario 2: God exists, but is not the Christian concept. Someone has it right, the Christians are misled, and the atheists are deluded fools.
Scenario 3: God does exist, but does not care about or concern itself with humans. All the religious are deluded fools, and the atheists, while also deluded, take the more practical approach.
Scenario 4: God does not exist. The religious are deluded fools, and the atheists are right.
There is no way to determine which of these scenarios is accurate, since God seems to refuse to prove his existence with direct, empirical evidence. That makes either scenario 3 or 4 the most likely, but not a certainty. You make your choice and you take your chances, but choosing Scenarios 1 or 2 is making a deliberate decision to be illogical and basically bet on the trailing horse. At least be honest and admit that, retreating into flat denials of denial is just silly.