The biggest false teachers/preachers/churches are: the Roman Catholic Church (some within this church are saved, if they trust in Jesus alone without relying on any good works), The Lutheran Church (which I grew up in), (and almost all Reformed and Calvinist Churches), Billy Graham, John MacArthur, and John Piper.
There are many, MANY other False Gospel Teachers who teach that SALVATION comes by ~repenting from sins~ and a ~commitment~ to ~lifelong discipleship~. These all teach WORKS RIGHTEOUSNESS salvation. But the Bible says that salvation is a FREE GIFT received through faith in Jesus.
People think these churches and preachers are conservative and respectable, but they are deadly. Jesus said: “MANY false prophets will appear and DECEIVE MANY PEOPLE.” (Matthew 24:11), and Galatians chapter one puts -two- damnation curses on anyone who preaches a False Gospel.
The Gospel is found in 1st Corinthians 15:1-4: “Now, brothers, I want to remind you of the Gospel I preached to you, which you received and on which you have taken your stand. 2 By this Gospel you are saved, if you hold firmly to the word I preached to you. Otherwise, you have believed in vain. 3 For what I received I passed on to you as of first importance: that Christ died for our sins according to the Scriptures,4 that he was buried, that he was raised on the third day according to the Scriptures…”
Notice that there is no mention of repentance of sins or discipleship included as the way to be saved. These are NOT part of the saving Gospel.
The Bible clearly says that salvation is “not of works, lest any man should boast.” (Ephesians 2:9)
Everyone who believes in Jesus alone, without relying on his or her good works to be saved, has everlasting life. (John 6:47: Most assuredly, I say to you, he [or she] who believes in Me HAS everlasting life.”)