I want to summrize the main similiraty & diffrences between those 3 religions:
1.God:
Judaism - One God
Christianity - 3 in 1 God
Islam - One God
2.Holy Scriptures:
Judaism - OT
Christianity - Accept OT and Add NT
Islam - Don't accept OT or NT,Just Quran
3.National or cosmopolitan religion:
Judaism - Religion for the Jewish Nation
Christianity - Cosmopolitan
Islam - Cosmopolitan
4.Calander:
Judaism - Combination of Solar & Lunar Calendar
Christianity - Solar Calendar
Islam - Lunar Calendar
5.Revelation:Judaism - Public revelation in front whole nation in mount Sinai.
Christianity - Private revelation(Jesus)
Islam - Private revelation(Muhammad)
6.Circumcision:
Judaism - Mandatory on the 8th day after birth.
Christianity - Not needed
Islam - Debate wheater it's mandatory or just recommended
7.Converting:
Judaism - a long process - need to learn all Judaism laws + Circumcision + Full-body immersion
Christianity - declartion of Faith.
Islam - declartion of Faith.
8.Wine/alcohol:
Judaism - no prohibition,used in religious rituals
Christianity - no prohibition,used in religious rituals
Islam - prohibition of any use
9.Can man be perfect?
Judaism - Only God is perfect,Human are imperfect "For there is not a righteous man upon earth, that doeth good, and sinneth not."(Ecclesiastes 7:20) and that why we can find faults about biblical figures.
Christianity - Like Judaism,But Jesus is perfect cause he's God...
Islam - All the prophets were perfect.
10.Authority:
Judaism - The Authority of Rabbies - According to the law which they shall teach thee, and according to the judgment which they shall tell thee, thou shalt do; thou shalt not turn aside from the sentence which they shall declare unto thee, to the right hand, nor to the left. (Deuteronomy 17:11)
Christianity - pope
Islam - I still don't have a clear statement.