God exists in a trinity of three distinct inseparable Persons; the Father, the Son, and the Holy Spirit.
Jesus is God in the flesh.
The Holy Spirit bore along and enabled men to write the Scriptures. Every word, thought and concept in the original text of Scripture is God breathed.
The Church is made up of those who are in the body of the Christ. The Church began on the Day of Pentecost. Christ is the Head and the saints are the Body.
Sin is lawlessness. When someone knowingly does something that ignores the standards that God has set for them to live by, they are sinning. Sin for a Christian is anything that is not done out from faith.
The Rapture is the next event in the prophetic calendar. This is the snatching away of the church. This event may happen at any moment. The Scriptures do not elaborate on the exact time when this will happen, except for stating that it will be prior to the tribulation.