I just began re-reading Letters of John Newton, and came across a brief confession of faith he drafted in a letter to Rev. Francis Okeley. In this confession Newton was attempting a hasty draft of those things "necessary to believe" (e.g. those doctrinal truths essential to Christian faith).
I believe that sin is the most hateful thing in the world; that I and all men are by nature in a state of wrath and depravity, utterly unable to sustain the penalty, or to fulfill the commands of God's holy law; and that we have no sufficiency of ourselves to think a good thought.
I believe that Jesus Christ is the chief among ten thousands; that he came into the world to save the chief of sinners, by making propitiation for sin by his death, by paying a perfect obedience to the law, in our behalf; and that he is now exalted on high, to give repentance and remission of sins to all that believe, and that he ever liveth to make intercession for us.
I believe the Holy Spirit (the gift of God, through Jesus Christ) is the sure and only guid into all truth, and the common priviledge of all believers; and under his influence, I believe the Holy Scriptures are able to make us wise unto salvation, and to furnish us thoroughly for every good work.
I believe that love to God, and to man for God's sake, is the essence of religion, and the fulfilling of the law; that without holiness no man shall see the Lord; that those who, by a patient course in well doing, seek glory, honour, and immortality, shall see eternal life; and I believe this reward is not of debt but of grace, even to the praise and glory of that grace, whereby he has made us accepted in the Beloved. Amen.
 Per custom of the time period, in this context Newton used the word 'religion' to mean 'Christianity'.
 Newton understood his language and formulation was probably lacking in accuracy. Just after writing the above, he noted to Okeley: "I pretend not accuracy in this hasty draught; they are only outlines, which if you please retouch and fill up at your leisure, I hope you will favour me with sight of it."