The 1644 London Baptist Confession Of Faith was produced by seven churches in that great city for the express purpose of denying the charge of being Anabaptists.
Remember that the Westminster Assembly (Puritan/Presbyterian) was, by appointment of Parliament, still in session and in the previous year (1643) had produced the Westminster Confession of Faith.
The ministers of the seven churches drafting the 1644 Confession, including William Kiffin, were eager to show to Parliament and its Presbyterian leadership that they were not to be feared and despised as the notorious Anabaptists which had come into England in the previous century.
The 1644 LBCF is drawn largely from the Congregational Aberdeen Confession of 1616. The primary changes made were specifically those of Baptist doctrine.
The 1644 was severely criticized by Daniel Featley who published a book in 1645 in which he charged the authors of this new Baptist Confession with, of all things, being Anabaptists! Featley dedicated his book to Parliament to the chagrin of Kiffin and his fellow Baptists.
It was this that prompted the revision of 1646. The purpose of the revision was to address each of Featley’s charges with language that would mollify the Presbyterian Parliament.
One example of those changes is in article 39 which, in the 1644 reads thus:
“That Baptisme Is An Ordinance Of The New Testament Given By Christ, To Be Dispensed Onely Upon Persons Professing Faith …”
Whereas in the revision of 1646 it reads:
“That Baptisme Is An Ordinance Of The New Testament Given By Christ, To Be Dispensed Upon Persons Professing Faith …”
Another is in article 38 wherein the 1644 reads:
“That the due maintenance of the Officers aforesaid should be the free and voluntary communication of the Church, that according to Christ’s Ordinance, they that preach the Gospel should live on the Gospel and not by constraint to be compelled from the people by a forced law.”
The 1646 revision reads:
“The ministers of Christ ought to have whatsoever they shall need, supplied freely by the church, that according to Christ’s ordinance, they that preach the Gospel, shall live of the gospel by the law of Christ.”
In these and other places the 1646 weakens its Baptist doctrine.
Clearly the 1646 revision sought to appease the hostile opponents in power at the time.
The 1689 took as its baseline the Savoy Declaration and the WCF. The authors clearly sought to agree, even in whole paragraphs, wherever conscience would allow them with their non baptist brethren. They nonetheless articulated the most distinctive Baptist ecclesiology that had been printed to that day.