The African Mercenary by Barry Sadler (Casca Series, Book 12) from Books In Motion.com

Casca Longinus, witness to the crucifixion of Christ on Golgotha. Emerging in our modern world as Casey Romain, he gathers the best-trained mercenaries available to topple the regime of Matthew Dzhombe, the crazed dictator of Kimshaka. Killing Dzhombe, who claims to be an immortal god, is only part of the problem. The tougher part is dealing with the treacheries of tribal politics and international intrigue. The West, the Chinese, and the Russians are all seeking the lion's share of Casca's conquest.