for the Islam rules you may refer to related questions below. The main rules is that Allah (or God and same God in Christianity and Judaism) is one and only one with no partner, no son, no father, no companion, no associate, and no equivalence.
However, in Christianity most of Christians believe that Jesus (peace be upon him) is God or son of God.
Another View:
The Godhead of Christianity - two divine beings known as the God (whom we call Father as He desires to be known and is loving to all) and the Word who became Jesus (see John 1:1-3; 14) - gave us His Law of Love called the Ten Commandments as our 'rules' to live by. Jesus also came and expanded the physical Law with its spiritual meaning - He made it 'full to the brim' for mankind.
Islam, Judaism and Christianity.
Christianity, Islam
Islam, Christianity
The Bible is to Christianity as the Qur'an (Koran) is to Islam.
Judaism, Christianity, and Islam have all claimed the Holy Land for themselves.
Christianity, but Islam may overtake Christianity relatively soon.
Christianity is to Bible as Islam to Quran.
Judaism, Christianity, and Islam religions.
Both Islam and Christianity originated out of Judaism.
For Judaism and Christianity it is Jerusalem. For Islam it is Mecca.
-- Islam -- Judaism -- Christianity
Christianity, Islam, Buddhism, Hinduism