Sabbath Changed to Sunday?

So, do we need to keep the Ten Commandments?

Jesus says:

If ye love me, keep my commandments.
- John 14:15 (KJV)

Clearly yes. But what about Sabbath?

Sabbath is kept on Saturday (Friday sunset to Saturday sunset to be precise), but most churches observe "Sabbath" on Sunday saying this was the day Jesus arose from the dead, and that it doesn't really matter what day we pick.

Has the Sabbath been changed to Sunday?

What you need to understand is that the Ten Commandments are a reflection of God's eternal character.

God doesn't change:

For I am the LORD, I change not.
- Malachi 3:6 (KJV)

The Sabbath is clearly on the seventh day.

For he spake in a certain place of the seventh day on this wise, And God did rest the seventh day from all his works.
- Hebrews 4:4 (KJV)

So why would the Sabbath commandment change? Are we saying that God made a mistake? Of course not.

For if Jesus had given them rest, then would he not afterward have spoken of another day. There remaineth therefore a rest to the people of God. For he that is entered into his rest, he also hath ceased from his own works, as God did from his.
- Hebrews 4:8-10 (KJV)

Sabbath is the seventh day of the week, and is specifically set for resting, and worshiping God.

It's a special day:

For in six days the LORD made heaven and earth, the sea, and all that in them is, and rested the seventh day: wherefore the LORD blessed the sabbath day, and hallowed it.
- Exodus 20:11 (KJV)

God blessed, and hallowed Sabbath day.

The act of changing the Sabbath (seventh day) to Sunday (first day), comes from satan himself.

And he shall speak great words against the most High, and shall wear out the saints of the most High, and think to change times and laws: and they shall be given into his hand until a time and times and the dividing of time.
- Daniel 7:25 (KJV)

Satan clearly thinks he's above the Law.

The change from Sabbath to Sunday is known as the mark of authority.

Of course the Catholic Church claims that the change [from Sabbath to Sunday] was her act. And the act is the mark of her ecclesiastical power and authority in religious matters.
- Faith of Our Fathers, p. 14 C.F. Thomas, Chancellor of Cardinal Gibbons

It's quite simple:
Sabbath = Seal of God
Sunday = Mark of the beast

The beast here is the Roman Catholic Church, and Sunday is their mark of authority.

During the end times, the Roman Catholic Church will create a One World Government, with a One World Religion to enforce the Mark of the beast (Sunday law).

Not observing Sunday law will become punishable by death.

At that time you will be asked to make a choice between God and His Law, and satan and his law. It doesn't get anymore dramatic than that.

For whosoever will save his life shall lose it: and whosoever will lose his life for my sake shall find it.
- Matthew 16:25 (KJV)

Who do you worship?