Dan V.,
Romans 10:14 tells us, how can they hear the gospel without a preacher? God commands Christians go and to witness gospel to lost people. When a person hears the gospel, I am sure that the Holy Spirit is working on person's heart like as Rev. 3:20 telling us, Christ is knocking the door(heart). Holy Spirit doesn't force person to make decision. Every person make own decision and choice. Also, we can resist the Holy Spirit. Like as I am disagree with Calvinism's teaching one point of the five points- 'Irresistible Grace'. We can resist against the Holy Spirit if we want to. Because, we all have freewill choice with decision.
Christ/Holy Spirit cannot 'break into' person's house into the door(Rev. 3:20), unless, person is willing to surrender or yield up to Christ, person is the responsiblity to respond back to God after hear the gospel first.
True, we all were born death(spiritual death) before we born again, that we were dead. But, it don't mean that we cannot respond back to God for salvation. God only revealing us by his creation, also, use Christians to witnessing the gospel.
Our responsible to respond back to God after we hear the gospel.
True, God does draw all people to Christ, but, He doesn't force all person to accept Christ. All people have choices and decision. Unless till a person finally yield up to Christ and ask Christ for forgive and received him into heart then to be saved - Romans 10:9,10, 13; and Rev. 3:20.
By the way, Rev. 3:20 is not always focus on salvation. It also speak toward Church(believers), that Christ desires to have fellowship with them. Many of us do niot want Christ to take control our life, we want to do ourselves own ways, not need Christ's help. And also, not having relationship with Christ. That why, most of us are lukewarm. Many Christians leave Christ out, and go in their own ways of life, many of them are aspostasy and later become lose at the end, and their names shall be blot out of the book of life(Rev. 2:10-11; 3:5).
In Christ
'Rev. 22:20 -Amen!