The above scripture is blatantly taken out of context to support the 'sinner's prayer' in the church's 'plan of salvation' as are the other scriptures used to support the plan of salvation (See THE SINNER'S PRAYER and PLAN OF SALVATION on www.preach-the-gospel.org.).
Christ is not telling unbelievers to pray a prayer to be saved in Revelation 3.20. He is chastening the Laodicean Church for their luke-warmness (Rev 3.16), telling them they are wretched and miserable, naked and blind (Rev 3.17 & 18). "As many as I love, I rebuke and chasten (Heb, 12.6 & Prov 3.11-12): be zealous therefore, and repent (Rev 3.19)." Christ is calling today's church to repent in the same manner for replacing the gospel with their 'plan of salvation'. For this little bit of leaven is preventing the gospel from being preached (Mt 16.6 & 12 and 1 Cor 5.6) .
When Christ appeared to the disciples the third time after his resurrection they were fishing. Peter girt his fishers coat (for he was naked) and jumped into the water (Jn 21.7). I believe this was because he was ashamed. Christ called him to be a fisher of men (Mt 4.19) and he was fishing for fish. Besides, earlier he denyed Christ three times (Lk 22.60). When His disciples came to shore (after a huge catch in obedince to Christ's command) Christ asked Peter three times if he loved him, and each time told him, "Feed my sheep." Peter's real job was to to preach the gospel and feed His sheep (Jn 21.17). Christ was calling Peter to repentance just as he was calling the Laodicean church and is calling today's church to repent for not preaching the gospel.
Christ's command is "Preach the gospel (Mk 16.15)." not present the 'plan of salvation'. The gospel - "Christ died for our sins, he was buried, and he rose the third day (1 Cor 15.1-4).", when uttered to others in person with our mouth (Eph 6.19), saves every one that believes (Rom 1.16 and Cor 1.21 & 4.15)." To preach this same gospel that Paul himself received and preached (1 Cor 15.3-4) ask another if they have heard the good news (Gospel means good news.) and tell it to them. It's that simple. Then teach them that believe to observe Christ's command to preach the gospel as well (Mt 28.20).
Revelation chapter three verse twenty is not for a sinner to say a 'prayer of salvation'. Christ is calling the Laodicean Church and today's church to repent. Then He will come in and sup with us (Rev 3.20) and with them that believe as a result of our preaching the gospel to them and teaching them to preach the gospel (Rom 1.16 & 1 Cor 1.21). "Behold, I stand at the door and knock... (Rev 3.20)."
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