“Abraham believed God, and it was accounted to him for righteousness.” Romans 4:3
Contrary to what some might believe, the Bible doesn’t teach that if you are a Christian, you will never stumble, fail, or fall short. But it does teach that if you are a true believer and have had a lapse or a stumble, you will always get up and move forward. That is one strong way to truly determine whether someone is a real believer. Although Abraham was a friend of God, which Scripture specifically mentions three times, it is also clear that he had his lapses of faith. Yet the Bible says that “Abraham believed God, and it was accounted to him for righteousness” (Romans 4:3). Does this mean that Abraham was declared righteous because of the good things he did? Did God justify Abraham because he lived such a holy, pure, and flawless life? Hardly. Any honest look at the life of Abraham would clearly show that he was a flawed man. Having said that, it is also important to point out that although Abraham deviated occasionally from the straight and narrow, he always came back.
If someone says he or she is a Christian but falls away and never returns to the faith, then he or she was not a believer. As 1 John 2:19 says, “They went out from us, but they were not of us; for if they had been of us, they would have continued with us; but they went out that they might be made manifest, that none of them were of us.”
True believers will be miserable in their sin and will eventually beat a quick path back to the cross of Calvary.