The Great Deception:

2 Thessalonians 2:11-17 King James

11 And for this cause God shall send them strong delusion, that they should believe a lie: 12 That they all might be damned who believed not the truth, but had pleasure in unrighteousness. 13 But we are bound to give thanks alway to God for you, brethren beloved of the Lord, because God hath from the beginning chosen you to salvation through sanctification of the Spirit and belief of the truth: 14 Whereunto he called you by our gospel, to the obtaining of the glory of our Lord Jesus Christ. 15 Therefore , brethren, stand fast , and hold the traditions which ye have been taught , whether by word, or our epistle. 16 Now our Lord Jesus Christ himself, and God, even our Father, which hath loved us, and hath given us everlasting consolation and good hope through grace, 17 Comfort your hearts, and stablish you in every good word and work.

Other deceptions mentioned in the bible:

"8 The wisdom of the prudent is to understand his way: but the folly of fools is deceit."  Proverbs 14:8 KJV

"26 Whose hatred is covered by deceit, his wickedness shall be shewed before the whole congregation. Proverbs 26:26 KJV 

"4 And the serpent said unto the woman, Ye shall not surely die." Genesis 3:4 KJV

Sunday Worship was Established by Emperor Constantine, and Christmas is a Pagan Holiday celebrating the Sun God’s return (polytheism). The mark of the beast on the forehead is thought by some to be representative of our thoughts (the mental worshiping and resting on a non-Sabbath day knowingly disobeying God’s commandment), or on the right hand (the action worshiping on a non-Sabbath day).