Whereas Buddhism focuses on the teachings of Gautama Buddha, who they believe is enlightened, but not deity, Christianity worships Jesus Christ as the son of God. Buddhism originated from the Indian continent, whereas Christianity started in the Roman province of Judea.
Buddhists believe that we are in a continual cycle in which we are born, die, and are reborn until we attain nirvana. Christians largely believe that all are eternally assigned to Heaven or Hell after death.
Buddhists use statues and icons as mediation objects to help them focus on the teachings of Buddha. Most Christian denominations forbid the use of statues and icons, though they often can be found in Catholic and Orthodox places of worship.
Roughly 300-350 million of the world's population are Buddhist. More than a billion Christians can be found across the globe.