If you're genuinely interested in knowing 'why' the Old Baptists make a distinction between eternal salvation and gospel salvation I would refer you to this short essay by Elder Michael Gowens, pastor of the Lexington Church:
Born Again: The Doctrine of Effectual Calling
http://www.sovgrace.net/theological...-born-again-the-doctrine-of-effectual-calling
Here's what the Reformed Baptists at Ligonier (R.C. Sproul) have to say about it:
Regeneration Is Immediate
Regeneration Is Immediate | Reformed Bible Studies & Devotionals at Ligonier.org | Reformed Bible Studies & Devotionals at Ligonier.org
Excerpts:
"..... we mean that
the new birth is something that happens without means. God the Holy Spirit alone works upon the soul, He does not use any other agent to change the heart."
"
Though God does not make use of any means besides Himself to bring about regeneration, He does work through means in our sanctification, the process of growing in personal holiness.
Scripture read and preached, the sacraments, prayer, and so on are all means that the Lord uses to mature us in Christ."
Here's what some of the 'Old School' Southern Baptists had to say about it:
Historic Baptists and Regeneration
Founders Ministries
Excerpts:
"In many Christian circles today experiencing "regeneration" (or "being born again") is simply something that happens when a person "makes a decision to accept Jesus Christ into his heart as personal Savior." Now it is certainly true that Jesus is the Savior, and that he saves sinners on a personal level. However,
the idea that the experience of regeneration is a decision which every sinner ought to make and indeed every sinner can make is an idea which is seriously defective."
"James P. Boyce (first president of the Southern Baptist Theological Seminary, in Louisville, Kentucky): "It is not strange, therefore, that they [i.e. regeneration and conversion] are often confounded. Yet, after all, the Scriptures also teach that
regeneration is the work of God, changing the heart of man by his sovereign will, while
conversion is that act of man turning towards God with the new inclination thus given to his heart" (Abstract of Systematic Theology, p. 374)."
"John A. Broadus (distinguished professor of New Testament and successor to Boyce at Southern Baptist Theological Seminary): "1. Q. What is meant by the word regeneration? A. Regeneration is God's causing a person to be born again. 9.
Q. Does faith come before the new birth? A. No, it is the new heart that truly repents and believes" (taken from Broadus' A Catechism of Bible Teaching, reprinted in A Baptist Treasury, pp. 67-68)."
"John L. Dagg (first writing Southern Baptist theologian; president of Mercer University in Georgia): "In our natural state we are totally depraved. No inclination to holiness exists in the carnal heart; and no holy act can be performed, or service to God rendered, until the heart is changed. This change, it is the office of the Holy Spirit to effect. . . . But,
in his own time and manner, God, the Holy Spirit, makes the word effectual in producing a new affection in the soul: and, when the first movement of love to God exists, the first throb of spiritual life commences" (A Manual of Theology, pp. 277, 279)."
"B. H. Carroll (founder and first president of Southwestern Baptist Theological Seminary in Fort Worth, Texas): "The true scriptural position [concerning regeneration] is this: There is,
first of all, a direct influence of the Holy Spirit on the passive spirit of the sinner, quickening him or making him sensitive to the preaching of the Word. In this the sinner is passive. But he is not a subject of the new birth without contrition, repentance and faith. In exercising these he is active. Yet even his contrition is but a response to the Spirit's conviction, and the exercise of his repentance is but a response to the Spirit's conviction, and
the exercise of his repentance and faith are but responses to the antecedent spiritual graces of repentance and faith." Carroll goes on to state that
"repentance and faith are fruits of regeneration" (An Interpretation of the English Bible, Volume 4, p. 287)."