The entire bible points to one simple reality, "Thy Kingdom Come". The prophets and disciples both looked forward to the day when God will set his kingdom on the earth. The death of Jesus opened the door of the kingdom to those of us who believe. In the mean time Jesus instructed us to pray for its fulfillment, "Thy kingdom come, Thy will be done, in earth as it is in heaven." This is the gospel that we preach.
We are aware that there are many people claiming to preach the truth. Remember, the bible tells us to prove all things. Jesus told us that in the last days many false prophets would come, and that they would deceive many. Therefore it is expedient for us to make sure we are hearing and believing the gospel, as it is written in the Holy Bible.
There is only one gospel. Therefore, it is an error for us (the world) to have so many doctrines, denominations and faiths. Many people ask "what faith are you"? However, the bible declares, "one Lord, one faith, one baptism". Brothers and sisters, there is only one way to please God and get into His kingdom and it is outlined thoroughly from Genesis to Revelation. Please heed the words of Jesus, "The time is fulfilled, and the kingdom of God is at hand: repent ye, and believe the gospel." (Mark 1:15)