Christianity is a religion that is based on the teachings of Jesus Christ. Christians believe that God created the world and that Jesus is the son of God who came to earth to teach people about how to live a good life and to save them from their sins. Christians believe that if they follow Jesus' teachings and live a good life, they will go to heaven after they die.
Theosophy is a spiritual movement that was founded in the late 19th century. Theosophy teaches that there is a universal wisdom that underlies all religions and that we can all learn from this wisdom to improve our lives and understand the world around us. Theosophists believe in the concept of karma and reincarnation, which means that our actions in this life will affect our future lives, and that we will continue to be reborn until we reach spiritual enlightenment.
Some people who are Christians also believe in theosophy and incorporate its teachings into their faith. They might believe that Jesus was a great teacher who taught universal wisdom that is similar to theosophy. They might also believe in karma and reincarnation, but might focus more on the idea that our actions in this life can affect our future lives, rather than on the idea of reaching enlightenment. These people might see Christianity and theosophy as complementary, different ways of exploring the same spiritual truths.