TROLLS SEEKING TO DEMONSTRATE THAT THEY ARE INTELLIGENT MAKE FOOLS OF THEMSELVES SO EASILY. How Much More Does A Person Make A Fool Of Himself (Herself) Before God When Rejecting His Existence. Who knows why God decided upon Ten Commandments for the Decalogue, the Bible does not say.

Why did God pick 10 commandments and not any other number?

If you read all 10,most of them are the same. Therefore they could have been shorter. (Killing is a sin yet God caused multiple genocides with the flood and killing everyone in Exodus)

No this is not a troll question.Questioning a belief does not make it a troll.One should properly evaluate a belief.

Happy Riches Answer requested by William McCarthy

If you actually read the Ten Commandments and compare them with what other people say they are, the first thing that stands out is how ignorant people really are these days. Yet they pontificate as if they were God Himself.

You say, “If you read all 10, most of them are the same.”

Let us see if you are right or you are really just an ignorant troll after all.

The Ten Commandments

1. And God spoke all these words, saying, “I am the Lord your God, who brought you out of the land of Egypt, out of the house of slavery. You shall have no other gods before me.”
2. You shall not make for yourself a carved 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 on 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.
3. 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.
4. 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. On it you shall not do any work, you, or your son, or your daughter, your male servant, or your female servant, or your livestock, 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 on the seventh day. Therefore the Lord blessed the Sabbath day and made it holy.
5. Honor your father and your mother, that your days may be long in the land that the Lord your God is giving you.
6. You shall not murder.
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, or his male servant, or his female servant, or his ox, or his donkey, or anything that is your neighbor's.  (Exodus 20:1–17 ESV)

As anybody, who has any wit can see, the Ten Commandments are not the same. They are ten distinct commands that apply to different aspects of human relationship and how one ought to relate to the Creator God who delivers people from the futility of the bondage of being born to die.

The House of Death reigns on Earth and humans are enslaved to it.

Of course, only those who truly know the Lord God, who have been delivered from the house of slavery (John 8:36), can appreciate the truth of the Ten Commandments. Unfortunately, only a comparative few are chosen (Matthew 22:14), which may be the reason so many people are ignorant of the obvious—and we are talking billions of people.

As for the name of God, surely you know His name (Proverbs 30:3-4), because if you do not, you will not know who to call so that you can be rescued from your bondage to death.

Something to contemplate:

גוְלֹא לָמַדְתִּי חָכְמָה וְדַעַת קְדשִׁים אֵדָע:

Neither have I learned wisdom, nor do I know the knowledge of the holy ones.

דמִי עָלָה שָׁמַיִם וַיֵּרַד מִי אָסַף רוּחַ בְּחָפְנָיו מִי צָרַר מַיִם בַּשִּׂמְלָה מִי הֵקִים כָּל אַפְסֵי אָרֶץ מַה שְּׁמוֹ וּמַה שֶּׁם בְּנוֹ כִּי תֵדָע:

Who ascended to heaven and descended? Who gathered wind in his fists? Who wrapped the waters in a garment? Who established all the ends of the earth? What is his name and what is the name of his son, if you know?

(Mishlei - Proverbs - Chapter 30:3–4)

As to why God decided upon ten Commandments, this is like asking why do people have ten digits on their fingers. Maybe the Ten Commandments exist because when ever we point a finger at another person, we ought to realize that finger might very well be pointed at us.

Some even say that when we point the finger—our index finger—at anyone, three more fingers (the middle, ring, and little) point back at us.

For Those Who No Longer Wish To Become Wise and No Longer Remain Ignorant