Some people claim Calvinism is synonymous with holy living. This is quickly dispelled when one considers that the authoritative Calvinistic Westminster Confession cites David as an example of an elect person who fell into grievous sins; and for a time continued therein. The implications of that are obvious. If David remained saved when in adultery and murder, then after salvation we too will remain saved, even if we behave in the same unholy way.
Another implication of this point of Calvinism is that one can be more vile and wicked after initial salvation then before yet still remain a child of God. In other words, many people who get saved were never guilty of murder like David, but now that they are saved they can turn to such sin and still retain their salvation, according to this teaching. Where is the holiness that is necessary to see the Lord (Heb 12:14) with such implications from once saved always saved as these?
Thirdly, D. James Kennedy was a Calvinist, who knew his theology and taught there are Christian adulterers with his false version of the sin unto death. The truth is, once saved always saved is one of the greatest threats to holiness and personal revival that exists. We must contend against this license for immorality and counterfeit grace message for the sake of the many souls that are hanging in the balance.
We are saved by grace (Eph. 2:5,8) and justified by faith (Rom. 5:1), but we can also fall from the same grace by which we were saved (Gal. 5:2-4) and have our saving faith shipwrecked by which we were justified (1 Tim. 1:19,20). That is the true New Testament message. DO NOT BE DECEIVED!