There are too many differences to list. Some of the major ones are:
- View of a creator: Christians believe undoubtedly that there is one god, who created everything and everyone. In Buddhism, it is not required to believe in any single or multiple god(s). It is possible to be Agnostic/Atheist and Buddhist. The idea of a creator is really irrelevant to Buddhist teachings.
- View of an afterlife: Christians believe that after you die, you will either be sent to Heaven or Hell (a possible state of purgatory is also a widely held belief among some Christians). If you live a good life in accordance with Christian teachings, you will be rewarded by spending eternity in the presence of God (aka Heaven). If you do not, you will have to spend your eternity in Hell. Buddhists, on the other hand, view life in a completely different way. They believe in reincarnation, which means that every living thing goes through a constant cycle of birth, life, death, and repeat.
- Goal of life: A Christian's main objective in life is to adhere to God's will, thus allowing him or her to gain entrance into Heaven. A buddhist's main objective in life, however, is to reach enlightenment. This means that through Buddhist practices and meditation, you have found the greatest truth or truths of the universe, allowing you to break the cycle of life and death, ultimately leading to release from the suffering of this world.
- How you are judged: Christians believe that God is the sole judge of our actions. He observes our lives, and based on how we live, decides our eternal fate. In the Buddhist faith, however, there isn't an overseeing figure to make these judgements. Buddhists believe in the law of Karma. This is a universal system of reward and punishment that is unbiased and unforgiving. All of your actions will have consequences. If you live a bad or evil life, you will be punished for it in one of your future lives. If you live a good life, you will reap the benefits because good things will happen to you.
These are just a few of the major differences between Christianity and Buddhism.