Salvation by faith in Christ death alone the very message of the good news of the gospel john 3:16.
What about his burial, and resurrection? Is that not also a part of the gospel, too? (See: 1 Corinthians 15:1-4). Also, while I am for the necessity of God's grace, both in how we are initially, and in how we are foundationally saved, I believe there is another aspect of salvation that is not preached in the churches today (Which negates the idea that the majority of churches are not preaching a form of turning God's grace into a license for immorality on some level). Meaning: You believe that no churches out there are not preaching salvation in Christ's death alone. Well, they may not exactly preach it in that way, they essentially believe a form of this. They all believe in a form of Easy Believism or in thinking they can sin and still be saved by having a belief in Jesus. Sure, some of these groups believe that one will live holy by having a belief in Christ's death, burial, and resurrection, but it is not exactly the holy living described in the Bible that I see. Sure, they may be against murder, rape, and child abuse, but they also say they can sin 24/7 in regards to other sins (like lying, lusting, hating, and cussing, etc.) and still be saved.
The aspect of salvation that is not being preached in the churches today is Sanctification (After we are saved by God's grace). This is the narrow way that Jesus talked about (Matthew 7:14).
Matthew 5-7 is the sermon on the Mount. If you know anything about the Sermon on the Mount, it is about righteous living, and instruction, and not a greasy form of grace that attempts to teach a person to ignore their sin while trusting in God's grace. Whether you believe that or not does not matter. The problem is that most churches teach today a greasy form of grace in some way. Well, this is what I believe. I believe we are living in the last days as 2 Timothy 3:1-9 says. Men shall be lovers of pleasure more than lovers of God. They will have a form of godliness but they will deny the power thereof.