Can you name one single difference between Judaism and Islam ?

Islam is the only religion of GOD send down for all mankind from the beginning till the end of the world , so Islam is the religion send down for all mankind of all nations , with Al Quran as the last Holy Book of GOD. While Judaism was send down for the Jewish race or the children of Israelites only , as having Torah as their Holy Book. Islam teach that Moses , Jesus and Muhammad (May GOD be pleased with them all) were the true Messengers of GOD , while the Jews deny the Apostleship of Jesus and Muhammad (May GOD be pleased wit both of them) .

Judaism prays to a wall.

Islam prays to the floor.

And Christianity prays to the celing.

Of course. Koran claims Ishmael is the Son of Promise, when the real deal (the Bible) clearly names Isaac.

Are you trying to imply they are the same?

They are fundamentally different.

You yourself pointed out a difference.

The Koran and OT ARE different. 

Each religion says that its respective text is scripture (sacred writings).

Judaism starts with a "J".

Koran starts with a "K".

The Koran is safeguarded by God, therefore not blasphemed.

The Qur'an claims that the holy scriptures given to the nation of Israel (centuries before the Qur'an was written) were corrupted by the Jews. They supposedly suppressed or obscured what otherwise would have confirmed Islam and the Qur'an e.g. the Hebrew account of Abraham and Isaac is wrong, for Muslims claim it was Ishmael, not Isaac. This is an insurmountable difference. As is Muslim denial of the Holocaust.

So, there are two differences, irreconcilable ones.

Old Testament

Leviticus 19:18  “‘Do not seek revenge or bear a grudge against anyone among your people, but love your neighbor as yourself. I am the Lord. ... 34 The foreigner residing among you must be treated as your native-born. Love them as yourself, for you were foreigners in Egypt. I am the Lord your God.

Dt 10:19 And you are to love those who are foreigners, for you yourselves were foreigners in Egypt.

Koran

Q.5:51 “O you who believe! Take not the Jews and the Christians as awliya’ (friends, protectors, helpers, etc.), they are but awliya’ to one another ...”

Q.8:12 “I will instill terror into the hearts of the unbelievers: smite ye above their necks and smite all their finger-tips off.”

Q.9:123 “Oh ye who believe! Murder those of the disbelievers and let them find harshness in you.”

First off they are spelled different. 

Names of prophets are different. 

Belief in one God for both but one also depends on good deeds while the other depends solely on God's mercy.

There are a lot of difference quite obviously so I am wondering what your point is or what the answers will help. 

Jerusalem as place of temple and worship of God and keeping laws of Moses

versus Mecca as place of worship and keeping laws of Muhammad, which do contradict some laws of Moses - like allowing a divorced woman to return to her first husband, after marrying another person, which was forbidden in law of Moses.

OT Judaism teaches that God chose Abraham's son from Sarah at old age, Isaac for an eternal covenant and that he was tested by sacrifice of God.

Islam denies it and claims that Ishmael, son of Abraham from slave Hagar, and it was Ishmael who was offered for sacrifice.