John Gill argues that the practice of infant baptism, retained by Protestant churches post-Reformation, is the most vital element of Roman Catholicism and the root from which its corruptions grow. He posits that the core of Romanism, the belief in sacraments conferring intrinsic grace and establishing priestly mediation, is fundamentally embodied in infant baptism. This central dogma, he contends, is the source of all Roman Catholic

This work presents a strong theological argument from a specific denominational perspective regarding the practice of infant baptism. The author's thesis is clearly articulated, connecting the practice to the perceived errors of Roman Catholicism. The text appears to be a historical theological treatise aimed at readers familiar with denominational debates surrounding baptism and church history.