Believer or Saved

"You believe that there is one God. You do well. Even the demons believe—and tremble!" (James 2:19) But they aren't saved - everybody talkin' about heaven ain't going there! Want to be sure we are? "And the Scripture was fulfilled which says, “Abraham believed God, and it was accounted to him for righteousness.” And he was called the friend of God. You see then that a man is justified by works, and not by faith only." (James 2:23-24) "...because Abraham obeyed My voice and kept My charge, My commandments, My statutes, and My laws.” (Genesis 26:5) 

Surety comes not just by believing the Word of God, but by OBEYING it, through the power of the Holy Spirit in us. "Since you have purified your souls in obeying the truth through the Spirit ..., having been born again, not of corruptible seed but incorruptible, through the word of God which lives and abides forever,..."(1 Peter 1:22-23) Christ Jesus explained it best, “Why do you call me, ‘Lord, Lord,’ but you don’t do what I say? The people who come to me, who listen to my teachings and obey them—I will show you what they are like: They are like a man building a house. He digs deep and builds his house on rock. ... But the people who hear my words and do not obey are like a man who builds a house without preparing a foundation. When the floods come, the house falls down easily and is completely destroyed.” (Luke 6:46-49 ERV)