what were the similarities between judaism, islam, and christianity?

Answer 1

-All three religions are monotheistic. (They worship only one god, as opposed to say Hinduism which recognizes many.)
-All three recognize a Messiah figure. They differ as to "who" "how" and "when" but they all have a belief in a Messiah.
-All three view Jerusalem as a holy city. Different reasons, but same feeling of reverence.
-They all recognize the Old Testament as scripture. The Muslims believe it was corrupted and the Jews don't recognize the New Testament. But they do recognize it to some degree.
-They all claim to be descendants of the prophet Abraham. The Jews and Christians through Isaac, and the Muslims through Ishmael.
-Jews and Muslims cover their heads to pray.
-Jews and Muslims segregate women from men in mosques and synagogues.
-Jews and Muslims both observe dietary laws.
-Muslims and Christians both recognize the virgin birth of Jesus Christ. Some Jews do as well, but mostly not.
-All three religions have a recognizable symbol: the cross, the crescent and the Star of David.

Answer 2

They all have common laws
Sharia for Islam
Halakhah for Judaism
Canon Law for Christianity

They have holy days (Friday, Saturday and Sunday in order of Islam-Judaism-Christianity)

They have different branches- Islam has Shia and Sunni, Judaism has Reform and Orthodox, and Christianity has Protestant and Catholic

They're monotheistic (one God)

They all include other 'spiritual beings' (angels and demons)

All believe Jesus existed, only Christianity believes him to be the son of God (Jewish believe him to be a false prophet, Islam he is a true prophet who's message has been corrupted)

Means of salvation centre around the right beliefs

All three Abrahamic religions

Answer 3

You mean 'are' don'tcha?

These three are the most widely known of the 'Abrahamic' faiths, or those based on the tenets and idiosyncracies of the 'God of Abraham' a 5th century BCE god designed by a semetic patriarch wandering the scrublands and deserts of asia minor at that time. By a quirk of fate, Christianity was adopted as state religion by the Roman Empire, Judaism was then promoted and expanded as an alternative, and Islam was founded based on these two precedents.

Most of the suffering in the world can now be laid at the feet of one group or the other belonging to this wellspring of less than inspired knowledge . . . .

Answer 4

There's a long history that involves these three. However, if you look at the roots of each, they all stem from the same God, albeit with a different name, and with the same set of ancient tribes in the middle east.

With the same roots, the similarities are going to be numerous. Are you looking for something in particular?