Those who have not accepted Jesus as your Lord and Savior can do so by inviting Him into their hearts. Jesus said that He stands at the door and knocks and this refers to the door of a person's heart.
Revelation 3:20 (NIV)
20 Here I am! I stand at the door and knock. If anyone hears my voice and opens the door, I will come in and eat with him, and he with me.
People must use their human freewill to invite Jesus to be Lord and Savior of their lives because Jesus will not force Himself upon anyone. The bible says that whoever will call upon the Name of the Lord will be saved.
Romans 10:13 (NIV)
13 for, "Everyone who calls on the name of the Lord will be saved."
In order to be saved it is necessary to verbally invite the Lord into the heart and call upon His Name for salvation. [See the teaching called New Creation Born of God] in the Core teaching lessons to learn more details about what it means to experience spiritual regeneration.
Acts 4:12 (NIV)
12 Salvation is found in no one else, for there is no other name under heaven given to men by which we must be saved."
It must be understood that there is salvation found in no one else and there is no other name under heaven given to men by which they must be saved. No religions on earth can save anyone [see the teaching lesson called “What is the Church?” that discusses false religions which are invented by mankind]. No church membership can save anyone. Only calling upon the Name of the Lord and experiencing spiritual regeneration can cause a person to have their names recorded in the Book of Life. Whoever does not have their name recorded in the Book of Life will be cast into the eternal fires of hell.
Revelation 20:15 (NIV)
15 If anyone's name was not found written in the book of life, he was thrown into the lake of fire.
A person must make Jesus both the Savior and the Lord of their life or they will not enter the kingdom of God. To be Lord means that Jesus is in control and they must live their lives in submission to the will of God. If they do not make Jesus their Lord and Savior then they will not enter then kingdom of God.
WITHOUT HOLINESS NO ONE WILL SEE THE LORD
Hebrews 12:14 (NIV)
14 Make every effort to live in peace with all men and to be holy; without holiness no one will see the Lord.
It is not just enough to repeat a salvation prayer because every person who comes to God must make Jesus Lord of their lives and produce fruit of holiness or else they will be chopped down like a barren tree and burned in the fires of hell. See my lesson called "Christians in Hell" in the core teaching lessons for more details.
To see more about issues that affect salvation such as mental assent please go to the link below:
Also go to the Poetry page to see my poem "Raped by Religion" that speaks about mental assent and how it is related to church people. The poem called "The Eagle" illustrates the importance of staying free from sin and using the human freewill to walk in holiness before the Lord.