After Christ was resurrected and ascended to heaven, He founded an Ecclesia. purpose of that Ecclesia, that called-out group of people, was to carry on the work He did while on earth. Christ commissioned His Ecclesia to go into the entire world and preach the same message that He preached while He was on earth (Matthew 24:14; 28:19-20; Mark 16:15; Acts 1:3-8).
The Bible shows that the early Ecclesia faithfully followed Christ’s directive and preached the gospel of the Kingdom of God (Acts 8:12; 14:22; 19:8; 20:25; 28:23, 31). Those of the early Ecclesia also put their focus on the coming Kingdom (Colossians 4:11; 2 Thessalonians 1:5).
Why then is "main stream Christianity" by passing this message but will blindly demand that they have TRUTH? Even the "religion" that bears the name of Christ, Christianity has clearly deviated from the teachings of Jesus Christ Himself!