I think it's significant to note from your own reference the bolded and underlined
ihas these same scripture that I am now posting as the scriptural cross-reference. My emphasis is on challenging what your post claims as changing the Holy days. Your saying it's the anti-christ TRYING to change the days but the cross-reference says the Lord has changed times and seasons.
Dan 2:20-22
20 Daniel answered and said, Blessed be the name of God for ever and ever; For wisdom and might are his.
21 And it is He that changeth times and seasons; He deposeth kings, and setteth up kings; He giveth wisdom to the wise, And knowledge to them that know understanding.
22 It is he that revealeth the deep and secret things; He knoweth what is in the darkness, and the light dwelleth with him.
Mark 1:15
and saying, The time is fulfilled and the kingdom of God has drawn nigh; repent and believe in the glad tidings.
Luke 21:8
And he said, See that ye be not led astray, for many shall come in my name, saying, *I* am [he], and the time is drawn nigh: go ye not [therefore] after them.
Acts 1:6-7
They therefore, being come together, asked him saying, Lord, is it at this time that thou restorest the kingdom to Israel?
7 And he said to them, It is not yours to know times or seasons, which the Father has placed in his own authority;
But besides your cross-references there are more reasons to believer that it is in fact God who changed the day of worship to Sunday, It's the first day of the week that the Lord resurrected from the dead and signifies a new beginning and a new age
Leviticus 23:10-11
10 Speak unto the children of Israel and say unto them, When ye come into the land that I give unto you, and ye reap the harvest thereof, then ye shall bring a sheaf of the first-fruits of your harvest unto the priest.
11 And he shall wave the sheaf before Jehovah, to be accepted for you; on the next day after the sabbath the priest shall wave it.
15 And ye shall count from the morning after the sabbath, from the day that ye brought the sheaf of the wave-offering, seven weeks; they shall be complete;
Christ is the firstfruit of the resurrection
1 Corinthians 15:20
(But now Christ is raised from among [the] dead, first-fruits of those fallen asleep.
23 But each in his own rank: [the] first-fruits, Christ; then those that are the Christ's at his coming.
Therefore this is the day that Jehovah has made; Let us exult and rejoice in it, because today God has begotten Him
Acts 13:33
That God has fully fulfilled this promise to us their children in raising up Jesus, as it is also written in the second Psalm, a"You are My Son; this day have I begotten You.''
So we give Him first place in everything, even over creation because He has brought in the new creation.
Colossians 1:18
18 And He is the Head of the bBody, the church; He is the beginning, the Firstborn from the dead, that He Himself might have the first place in all things;
And why we call it the Lord's day rather than the Sabbath
Revelation 1:10
I was in spirit on the Lord's Day and heard behind me a loud voice like a btrumpet,
Because He is our rest
Matthew 11:28-29
Come to Me all who toil and are burdened, and I will give you rest.
Take My yoke upon you and learn from Me, for I am meek and lowly in heart, and you will find rest for your souls.