1) Christianity offers the assurance of salvation. The Bible says "believe on the Lord Jesus Christ and you WILL be saved" in many places. The Bible teaches that Jesus is the Son of God and because of his resurrection, we can believe his promises...mainly that he has power over death and will exercise that power in our salvation.
The Arab people do have close historical ties to Judaism and Christianity though. Abraham, the Father of the Jewish nation, had two sons, Ishmael and Isaac. Arabs descended from Ishmael, Jews from Isaac. And before Muhammad came on the scene around 600AD, their religions had many parallels. Because of this, Islam does revere many of the Old Testament Hebrew prophets, including Abraham and Moses. They even revere Jesus as a great prophet...but they do not believe he is the Son of God. Matter of fact, they don't believe in his death and resurrection, instead claiming that another anonymous person was crucified in his place, and that he lived to a ripe old age. Muslims worship a god, Allah, but have no personal relationship with him. They also have no guarantee of salvation...of entrance into paradise. Instead, they believe in living a "good" life, and after that, it's a crap shoot. They hope their god finds them worthy, but their god makes no promises. There is one exception though...martyrs are guaranteed entrance into paradise and seventy virgins to attend them once they arrive there. It is no wonder so many young Muslims are willing to give their lives in suicide bombings and the like.
2) Allah is not the same as the God of the Bible. Allah is a pagan Arabic moon god. The crescent moon found on many Muslim nation flags is symbolic of this god. More on that at:
ALLAH, the Moon God
Owen, you would do well to follow Jesus, the Son of God, who came to earth to show men the way to have personal fellowship with God, and offered himself as a sacrifice, the way to salvation. He performed many miracles that prove his message was from God. His death and resurrection are the final proof, without which Christianity is meaningless.