How do you beat the final boss of madness interactive

To tell you the truth, the final level is ridiculously difficult. Make sure that you have full ammo before going in, and I recommend taking several 'High Calibur' and 'Munitions Man' skills. I used the combat shotgun and the M-16. On entering the room, three agents will spawn. After they die, there will be a very brief pause before Jesus appears in the center, flying above you. He will move to one side- sometimes all the way to the wall, sometimes barely at all. This pause is absolutely crucial- you need to jump in the air, activate bullet-time, and pump him with as many shots as possible. Maingame Jesus has 175 health, whereas Challenge Jesus has only 25, and your character has 10. In other words, this is very, very difficult.
You will want to enter the room with at least three lives. Although killing the zombie agents is important, Jesus will continue to resurrect any that you kill, so getting rid of him is the first priority. Try to use the shotgun or explosives to clear enough of the agents to allow a concentrated attack on Jesus. With a little skill, a lot of luck and even more time, he will eventually die. When he does, finish off the remaining agents and proceed.