Christianity is one of the oldest religions in the world, and the largest religion at the moment, while Sikhism is a newer religion compared to Christianity. While both belief in the existence of one God, the only way to differentiate them is by comparing certain practices of the two. Christianity preaches that one can only attain salvation by believing in Jesus Christ and in everything He represents.
Sikhism preaches that one can only attain salvation by worshiping God with a pure mind, by doing good deeds, and by fighting the five evils i.e., lust, greed, attachment, ego, anger, and also by praying.
Christianity is a religion that is based on the teachings of Jesus Christ, while Sikhism is based on the teachings of Guru Nanak Dev Ji. Although Christianity also believes in monotheism; however, the concept of the Trinity i.e., God the Father, Son, and Holy Spirit, is something Sikhism does not believe in.