John Gill, (a man after my own heart!) views the keeping of Lent and other non-biblical “holy days” as part of the antichristian system of religion.

To observe another passage, though not in this prophecy, yet delivered out by the same inspired writer, which predicts some of the notorious doctrines and practices of antichrist; it is in 1 Timothy 4:1-3 where the apostle foretells a departure from the faith in after-times, and the appearance of seducing spirits, who should teach doctrines of devils. The doctrines of demon-worship; like that of the heathens, their demons being a middle sort of beings between God and men, and mediated between them; and such are the angels and saints departed, the Papists direct men to pray unto; and which is called worshipping devils and idols of gold, silver, brass, stone, and wood (Rev. 9:20), forbidding to marry; matrimony, though God’s ordinance, and…