Can church doctrine be corrected?

There is a lot of debate in society today about what is wrong with the church and whether some things should be accepted, for example gay and transgender marriages. They have been trying to fix the churches for almost 2000 years and so far no one has succeeded! There are Lutheran, Catholic, Pentecostal, Free Church, etc…
If we study the Bible truthfully we find that in the early days of the congregation nothing was known about churches. Paul commanded the elders to be set up in every city, and there was no teaching about popes and archbishops. The word ’church’ was not added to translations of the Bible until later on. The message of salvation, that Jesus atoned for the sins of men on the cross and rose from the dead, has taken a back seat.
Let us go back to basics: ”Then Peter said unto them, Repent, and be baptized every one of you in the name of Jesus Christ for the remission of sins, and ye shall receive the gift of the Holy Ghost.” Acts 2:38