We agree that salvation can only be obtained through Christ and that that is enough to be saved, only that, and no amount of works without that will constitute one's salvation.

Where it sounds like we differ is on antinomianism, the belief that once one tells themself they accept Christ they have no reason or need to be reborn to Christ and to live in Christ, struggling to obtain a Christ like example on earth, a process called sanctification.

The big problem is as I see it is that humans regularly lie to themselves and their actions betray the things they've told themselves for mere assurance.

There is a real danger in Christians doing a "one and done" with Christ, and not living like they truly fear God.

If one accepts Christ is God, it logically follows that they will take up their cross and (however poorly) attempt to make their own Christ like example on this earth.

That process, sanctification, is what happens when a Christian orients his life forcefully towards Christ as a result of his beliefs, thus (however poorly) disciplining his wordly example in light of his salvation, becoming soil for God's works.

A tree saved by Christ should start to bear different fruit than a tree that refuses Christ.

The above should worry casual Christians into living like earnest Christians, ensuring they leave a good example behind.