That being said, how do you know if you really believe? I addressed this in my last sermon found HERE. Here's a written excerpt:
Dr. Victor Shepherd once said, "Our knowledge of someone is precisely the DIFFERENCE that person has made within us as a result of our meeting him/her. To know God is to be profoundly ALTERED by God through having encountered him."
The more you know a person, the more effect there is on your life. That's the principle. When you truly know a person, your life is made different forever. I'll give you an example from my own life. I've dated my wife for 13 years (we've been married for 5). I can confidently say that since I've gotten to know her, she's made the biggest impact in my life. I've been made different forever. If my life wasn't much different after 13 years, then I really couldn't say I know my wife. I may know facts about her (e.g. her favourite colour is blue; she likes sushi; she is the eldest child, etc.), but I don't really know her intimately.
With respect to our relationship with God, the same principle holds true. We know God when we have been made different forever through our encounter with Him. Sadly, many people know FACTS about God (e.g. believe that Jesus did this and that), but they don't know God PERSONALLY - God has not had a profound, everlasting impact in their life. When you know God, the direction of your life MUST change because that's the kind of IMPACT God makes on a person. He works in a person's heart, so she no longer desire to sin, but desire to live in holiness and obedience to Him. When you truly know God, your priorities; life direction; behaviour; words; innermost desires change as a result of your relationship with Him.
So friend, my question to you would simply be: Has your life changed because of Jesus? Would others who know you well agree?
[Answered by Pastor HM]
For further reading:
1. John Piper's message on "Believing in Your Heart." He writes this:
Therefore, believing in your heart that God raised Jesus from the dead is much more than accepting a fact. It means being confident that God is for you, that he has closed ranks with you, that he is transforming your life, and that he will save you for eternal joy. Believing in the resurrection means trusting in all the promises of life and hope and righteousness for which it stands. It means being so confident of God's power and love that no fear of worldly loss nor greed for worldly gain will lure us to disobey his will. That's the difference between Satan and the saints. O might God circumcise all our hearts to love him and to rest in the resurrection of his Son.
2. John Walvoord's article entitled, "Do You Really Believe in Jesus?" He writes:
The Bible uses the word believe or the word faith hundreds of times to describe an act of trust. It is an act of the mind in that it involves comprehension of some truth, to at least a limited degree. The Bible indicates that the Holy Spirit works in our hearts and enables us to understand what we should believe to be saved (John 16:7-11).
Belief is also an act of the will because it involves a decision on our part (John 7:17). Are we going to trust the facts about the person and the work of Christ? The Bible teaches that Jesus Christ was the God-man — all that God is from eternity, and all that man is apart from sin. The Bible also repeatedly presents, in both testaments, the fact that God Himself provides Christ as the One who would die on the cross for our sins. He was the lamb of sacrifice (John 1:29). He died in our place. He "bore our sins in his body" (1 Pet. 2:24). He died "the righteous for the unrighteous" to bring us to God (1 Pet. 3:18).