“We believe the Bible to be the inspired and only infallible written Word of God.
We believe that there is only One God, eternally existent in three persons: God the Father, God the Son and, God the Holy Spirit.
We believe in the blessed Hope, which is the rapture of the Church of God, which is in Christ, at His return.
We believe that the only means of being cleansed from sin is through repentance and faith in the precious Blood of Jesus Christ.
We believe that regeneration by the Holy Ghost is absolutely essential for personal salvation.
We believe that the redemptive work of Christ on the Cross provides healing for the human body in answer to believing prayer.
We believe that the Baptism of the Holy Spirit, according to Acts 2:4, is given to believers who ask for it.
We believe in the sanctifying power of the Holy Spirit, by whose indwelling the Christian is enabled to live a holy and separated life in the present world.”

COGIC Logo

The Church of God in Christ website says that they believe that the Bible contains all necessary information for their beliefs and practices. They also seem to use several common non-Biblical interpretations, such as the trinity (Father, Son, and Holy Ghost), which is a common Christian belief which is not mentioned in the Bible.

Above: Testimony from Church member about receiving the Holy Ghost, as discussed below.

Unlike many denominations, they believe that a baptism of the Holy Ghost, shown by speaking in tongues, is “mandatory for all men” in order to be controlled by the Holy Ghost in all of their actions. They consider this act to be one of sanctification, meaning that they can no longer sin. This is separate from baptism, which they also practice. They use an immersion form of baptism as opposed to “sprinkling.”

COGIC holds in common with many Christian denominations the belief in Jesus Christ, the son of God, his birth via the Virgin Mary, his life, death, and resurrection, and his ascent to heaven. They believe that the Holy Ghost (or Holy Spirit) is a gift sent by the Father to empower the Church, and that the Father is the creator of the Earth. This denomination also believes in angels and demons, and in Satan, the king of demons.

COGIC practices the sacraments of Holy Communion and feet washing, which they call ordinances. Baptism is also considered an ordinance.

COGIC believes that Jesus will someday return physically to the earth and that everyone in the Church will rise up to meet him in midair. They also believe in divine healing and miracles.

https://www.youtube.com/watch?v=d7IFO47Cj5Y

References:
COGIC statement of faith: http://www.cogic.org/about-company/statement-of-faith/
COGIC system of beliefs: http://www.cogic.org/about-company/what-we-believe/