In the Trinity of the eternal Godhead: The Father, The Son, and The Holy Spirit
(John14:26)

In the inspired and inerrant Word of God, The Bible
(2 Timothy 3:16) 

In the inherent sinfulness of mankind
(Romans 3:23) 

In the payment for this sin only by Jesus Christ
(1 John 2:2) 

In salvation by grace through faith and not by works
(Ephesians 2:8) 

In water baptism
(Romans 6:4; Col. 2:12)

In the baptism of the Holy Spirit with the evidence of speaking with other tongues
(Acts 2:4)

 In Divine Healing
(1 Peter 2:24)

 In the imminent return of Jesus Christ
(Matthew 24:36-46)