Do Calvinists Believe the Heresy Known As Sinless Perfection? Of Course Not

[Iconoclast]

Not at all .Such a heresy was long ago Dispatched as God dishonoring teaching.
We live in a day where people have tried to remove foundational truth. The Confessions of faith were ared still are used to protect God's people from such vial errors.
Here from the 1689 confession of faith we see the Historic Confessional position;

Chapter 13 Of Sanctification 1 They who are united to Christ, effectually called, and regenerated, having a new heart and a new spirit created in them through the virtue of Christ’s death and resurrection, are also a farther sanctified, really and personally, through the same virtue, by His Word and Spirit dwelling in them;

The dominion of the whole body of sin is destroyed, dand the several lusts thereof are more and more weakened and mortified, and they more and more quickened and strengthened in all saving graces, to the practice of all true holiness, without which no man shall see the Lord. (Act 20:32; Rom 6:5-6; Joh 17:17; Eph 3:16-19; 1Th 5:21-23; Rom 6:14; Gal 5:24; Col 1:11; f 2Co 7:1; Heb 12:14) Confession of Faith of 1689

2 This sanctification is throughout the whole man, yet imperfect in this life; there abideth still some remnants of corruption in every part, whence ariseth a continual and irreconcilable war; the flesh lusting against the Spirit, and the Spirit against the flesh. ( 1Th 5:23; Rom 7:18,23; Gal 5:17; 1Pe 2:11)

3 In which war, although the remaining corruption for a time may much prevail, yet through the continual supply of strength from the sanctifying Spirit of Christ, the regenerate part doth overcome; and so the saints grow in grace, perfecting holiness in the fear of God, pressing after an heavenly life, in evangelical obedience to all the commands which Christ as Head and King, in His Word hath prescribed them. ( Rom 7:23; Rom 6:14; Eph 4:15-16; 2Co 3:18, 7:1)

 

[Iconoclast]

The 1742 Philadelphia Cinfession Of Faith

It taught the exact same thing;

Chapter 13 Of Sanctification

1. They who are united to Christ, effectually called, and regenerated, having a new heart and a new spirit created in them through the virtue of Christ's death and resurrection, are also farther sanctified, really and personally, through the same virtue, by His Word and Spirit dwelling in them; the dominion of the whole body of sin is destroyed, and the several lusts thereof are more and more weakened and mortified, and they more and more quickened and strengthened in all saving graces, to the practice of all true holiness, without which no man shall see the Lord. (Acts 20:32; Rom. 6:5, 6; John 17:17; Eph. 3:16-19; 1 Thess. 5:21-23; Rom. 6:14; Gal. 5;24; Col. 1:11; 2 Cor. 7:1; Heb. 12:14)

2. This sanctification is throughout the whole man, yet imperfect in this life; there abideth still some remnants of corruption in every part, whence ariseth a continual and irreconcilable war; the flesh lusting against the Spirit, and the Spirit against the flesh. (1 Thess. 5:23; Rom. 7:18, 23; Gal. 5:17; 1 Pet. 2:11)


3. In which war, although the remaining corruption for a time may much prevail, yet through the continual supply of strength from the sanctifying Spirit of Christ, the regenerate part doth overcome; and so the saints grow in grace, perfecting holiness in the fear of God, pressing after an heavenly life, in evangelical obedience to all the commands which Christ as Head and King, in His Word hath prescribed them. (Rom. 7:23; Rom. 6:14; Eph. 4:15, 16; 2 Cor. 3:18, 7:1)