Faith normally involves three things for an adult or someone at an age to make a decision to answer God’s call to “believe on the Lord Jesus Christ” (Acts 16:31)
1. Admit that I am a person who has committed offenses against God and that I cannot without God’s help live a life that is pleasing to Him.
2. Agree to turn from following self as “boss” and submit myself to God as Father, Master and Friend, seeking to live a life pleasing to God guided by Scripture and the Holy Spirit.
3. Believe that God can and will “save” you if you sincerely ask Him. Receive and believe in Jesus into the heart (the seat of the mind, will and emotions) and be “born of God” becoming a person with a child to Parent, person to Parent relationship. From this time on to live as a “Jesus follower”, which is what is means to be a Christian in practical terms. All of this occurs because God’s Holy Spirit is reaching out to you and persuading you: “come to me all you who are weary and weighed down with the burdens of life and I will give you rest.”
Belief is from the heart and not all believers come to faith in the same way.The famous John Wesley of the Methodist Church said that he “felt” his “heart strangely warmed.”All we know is that we are now trusting Jesus Christ to save us from our sins and make us a “new creation” in our mind will and emotions.
If you were one like me who needed to “know” that they had trusted Jesus “in the heart”:This is a suggested prayer or you may use your own.
"God, I know that I have sinned against you and am deserving of punishment. But Jesus Christ took the punishment that I deserve so that through faith in Him I could be forgiven. With your help, I place my trust in You for salvation. Thank You for Your wonderful grace and forgiveness - the gift of eternal life! Amen!"https://www.gotquestions.org/Romans-road-salvation.html
Faith in Jesus: Born Again, The New Birth, What is it?
The term “born-again Christian” has become somewhat common in our culture, however the term, taken from the Gospel of John, chapter three is as old as the Church and the Scriptures of the Newer Testament.
Differing terms have been used over the centuries: believe, believe on, trust in, regeneration, chrismation, born-again and even confirmation but the terms all refer to one thing—coming to a point where the body, soul and spirit of a person go from self to God as the One who owns, adopts and makes a person spiritually new. It indicates a change from “Me” to “Thou” in relation to God.
Now there are subtle differences in the terms above. Some of them refer to a covenant made between the parents of an infant pledged to God in which they return to God what God gave to them: the child. Some refer to those at the so-called “age of reason” when a younger child decides to make Jesus their Savior and Lord. All of them mean that the body—soul—and spirit now belong to Jesus Christ.