Where does this, "ask Jesus into your heart" nonsense come from?
'Look, I [Jesus) stand at the door, knocking. If anyone hears my voice and opens the door I will come into him and dine with him, and he with me (Revelation 3:20)."
Note how Paul urges the wayward Galatians to recall the experiential confirmation of their initial reception of the Gospel:
Did you experience so much for nothing, if it really was for nothing? Well, then, does God supply you with the Spirit and work miracles among you by your doing the works of the Law or by your believing what you heard (Galatians 3:4-5)?"
Billy Graham was incredibly effective as an evangelist, routinely winning thousands to Christ in each evangelistic campaign. Billy used to say, "Many Christians have just enough religion to inoculate them against the real thing." The real thing is a living, intimate relationship with Jesus Christ, not just some dry presentation of the need to repent and believe the Gospel.
Notice the essential role of spiritual experience in Paul's preaching of the cross:
"My speech and my proclamation were not with plausible words of wisdom, but with
a demonstration of the Spirit and of power, so that your faith
might not rest on human wisdom, but on the power of God (1 Corinthians 2:4-5)."
Evangelist D. L. Moody was once confronted by man who complained: "I don't like your method of winning souls!" Moody replied, "I'm not sure I like it either. What's your method of winning souls?" There is a reason why reformed and other mainline denominations are in decline, whereas Pentecostal churches are growing in leaps and bounds--the stress on the Gospel's experiential dimension, a life-changing encounter with Jesus Christ.
Notice, too, that the validity of one's subjective experience of the indwelling Christ needs to be tested, not one's mental affirmation to Gospel talking points:
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Examine yourselves to see if you are living in the faith? Test yourselves.
Do you not realize that Jesus Christ is in you (2 Corinthians 13:5)?"