When we talk about true christianity on the basis of christian faith. This shows that the faith of a true christian must be found on human wisdom that ideology or reasoning and this is solely on the power of God which is the gospel of Christ.
The truth has been supported by the apostle Paul in 1 Corinthians 2:4-5 and Roman 1:16, this shows that the gospel is not just a message but it's that jump out that leads to salvation for everyone who believes. In the world feed it's so many beliefs and religious ideologies which were invented by man.
Brother Eli reminded us that the sense is not one of those systems instead it stands on that foundation the teaching of the lord Jesus christ himself. In Mark 1:14-15. Jesus came preaching the gospel of the kingdom of God which is calling everyone to repent and believe the gospel.
The gospel is not just that doctrine, it's a life-changing truth that transforms sinners, renew minds and unites all believers just into one faith. Therefore in order to be a true christian which means is to uncover faith not on the ideas of human but on living and the eternal power of God which is also found in the gospel of Christ.