I will avoid taking Jesus' name in vain as much of you have...
But this is a great opportunity to explore the humanity of Jesus: Jesus was a breakable man. He was both 100% man AND 100% God but he was clearly birthed in order to die in a very human way. There were many attempts at his life but he had always managed to get away before any gangs and physical harm found him. There clearly is evidence of superhuman endurance both physically and mentally, going without food for 40 days in a desert. But there is clearly evidence that he could readily bleed and fatigue given enough violence.
If there were a person who could pull off the batman persona, one who had extensive martial arts training and pushed his body to the limits of human ability and was fueled by the brutal deaths of his two parents... I'd wager he could beat Jesus up no problem.
However, he could not kill him. No matter what he does. He'd be like the bullet dodger from Snatch. Jesus came to this world to die for the sins of the world not because Batman wants him dead. That's where that 100% God figure comes in. He is still the master and creator of this world and only he can decide whether he can die or not.
Jesus wouldn't fight back, he wouldn't be able to do any serious damage if he could but he would not die.
That's just as long as he's consistent with his personality.. and seeing as how he is God and he is, was and alway will be... he probably won't go a changing on a whim.
If he did he'd probably just unleash his army of angels and start opening up some scrolls on his foes.
I definitely wouldn't mess with the second coming of Christ though...