Forgive me. I was incorrect about the Bible thing. It was the Catholic Catechism that is writen as the ten Commandments and is often mistaken for them. See bellow
The Catholic Bible:
1. You shall not have any other gods beside me.
2. You shall not carve idols for yourselves in the shape of anything in the sky above or on the earth below or in the waters beneath the earth; you shall not bow down before them or worship them.
3. You shall not take the name of the Lord, your God, in vain.
4. Remember to keep holy the Sabbath day.
5. Honor your father and mother.
6. You shall not kill.
7. You shall not commit adultery.
8. You shall not steal.
9. You shall not bear false witness against your neighbor.
10. You shall not covet your neighbor's house. You shall not covet your neighbor's wife, nor his male or female slave, nor his ox or ass, nor anything else that belongs to him.
(Exodus 20:4-17, The New American Bible)
The Catholic Catechism:
1. I, the Lord, am your God. You shall not have other gods besides me.
2. You shall not take the name of the Lord, your God, in vain.
3. Remember to keep holy the Sabbath day.
4. Honor your father and your mother.
5. You shall not kill.
6. You shall not commit adultery.
7. You shall not steal.
8. You shall not bear false witness against your neighbor.
9. You shall not covet your neighbor's wife.
10. You shall not covet anything that belongs to your neighbor.
(The Teaching Of Christ, A Catholic Catechism For Adults, pg. 276)
The Catholic Bible prohibits the making of idols. It also prohibits bowing down before these images. Why would Catholic leaders leave this commandment out of their Catechism?
Could it be because their practice does not follow their Bible? The Second General Council of Nicea (787 a.d.) approved the veneration of icons and statues.
What Catechism were you getting this from? Clearly not the official Catechism, probably some childrens simplified catechism.
Here is what the official catechism states in regards to the ten commandments.
First just after paragraph 2051 it quotes from the Bible directly as follows;
The Ten Commandments
Exodus 20 2-17
I am the LORD your God, who brought you out of the land of Egypt, out of the house of bondage.
You shall have no other gods before me. You shall not make for yourself a graven image,
or any likeness of anything that is in heaven above, or that is in the earth beneath, or that is in the water under the earth; you shall not bow down to them or serve them; for I the LORD your God am a jealous God, visiting the iniquity of the fathers upon the children to the third and the fourth generation of those who hate me, but showing steadfast love to thousands of those who love me and keep my commandments.
You shall not take the name of the LORD your God in vain; for the LORD will not hold him guiltless who takes his name in vain.
Remember the sabbath day, to keep it holy. Six days you shall labor, and do all your work; but the seventh day is a sabbath to the LORD your God; in it you shall not do any work, you, or your son, or your daughter, your manservant, or your maidservant or your cattle, or the sojourner who is within your gates; for in six days the LORD made heaven and earth, the sea, and all that is in them, and rested the seventh day; therefore the Lord blessed the sabbath day and hallowed it.
Honor your father and your mother, that your days may be long in the land which the LORD your God gives you.
You shall not kill.
You shall not commit adultery.
You shall not steal.
You shall not bear false witness against your neighbor.
You shall not covet your neighbor's house; you shall not covet your neighbor's wife, or his manservant, or his maidservant, or his ox, or his ass, or anything that is your neighbor's.
Deuteronomy 5:6-21
I am the LORD your God, who brought you out of the land of Egypt, out of the house of bondage.
You shall have no other gods before me . . .
You shall not take the name of the LORD your God in vain . . .
Observe the sabbath day, to keep it holy. . .
Honor your father and your mother . . .
You shall not kill.
Neither shall you commit adultery.
Neither shall you steal.
Neither shall you bear false witness against your neighbor.
Neither shall you covet your neighbor's wife . . . You shall not desire . . . anything that is your neighbor's.
Later it explains the difference in numbering in paragraph 2066
2066 The division and numbering of the Commandments have varied in the course of history. The present catechism follows the division of the Commandments established by St. Augustine, which has become traditional in the Catholic Church. It is also that of the Lutheran confessions. The Greek Fathers worked out a slightly different division, which is found in the Orthodox Churches and Reformed communities.
I think the part that you are refering to is based on the following:
A Traditional Catechetical Formula
1. I am the LORD your God: you shall not have strange Gods before me.
2. You shall not take the name of the LORD your God in vain.
3. Remember to keep holy the LORD'S Day.
4. Honor your father and your mother.
5. You shall not kill.
6. You shall not commit adultery.
7. You shall not steal.
8. You shall not bear false witness against your neighbor.
9. You shall not covet your neighbor's wife.
10. You shall not covet your neighbor's goods.
But this is just a quick summary for use by catechists to help them learn basics of the the commandments. The Catholic Church has never removed any of the commandments. This is just a lie told by some Protestants in their hatred of the Catholic Church to make their position seem stronger.