Christianity Is The BEST Religion....

[Fake Messiah]

Christianity is the best religion because you'll have a god that you can trust to lead you to the light, a god that will help you through dark times.

Which christianity? Mormons? Jehovah's witnesses? Lutherans? All of them?
But why do you think that god leads you to light when the Bible says he lives in a dark place?
The Lord said that he would dwell in the thick darkness. 1 Kings 8:12, 2 Chronicles 6:1
He made darkness his secret place; his pavilion round about him were dark waters and thick clouds of the skies. Psalm 18:11
Clouds and darkness are round about him. Psalm 97:2

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First of all the Muslim religion was founded by descendants of Abraham, through Ishmael, so essentially it's the same God

Yeah that's why Christians have been warring with Muslims for many centuries and every time Muslims occupied some country in Europe they forced Christians to convert to Islam. Why do you think there are so many Muslims in Bosnia? Did they all wake up one day and threw away their crosses and embraced Allah? Or were they forced into it by people that saw them as heathens?

BUT the bible states that all Israel will be saved

Saved from what? Bible or more closely NT is actually very anti-Semitic. One does not have to read very far into the Book of John, the Book of Acts, or the writings of Paul to see comments that easily buttress anti-Semitism. Like John 5:16 "Therefore did the Jews persecute Jesus, and sought to slay him, because he had done these things on the sabbath day",
John 5:18 "The Jews sought the more to kill him, because he not only had broken the sabbath, but said also that God was his Father, making himself equal to God"  
John 7:1 "After these things Jesus walked in Galilee: for he would not walk in Jewry; because the Jews sought to kill him".

These three verses alone are sufficient to create hatred of Jews in the minds of Christians. But they are only part of a larger picture. In John 8:52 the Jews directly accuse Jesus of "having" a devil and according to John 18:35 the Jews are responsible for delivering Jesus to Pilate to be executed. John 19:1-23 indicates that, along with the Roman soldiers, Jews were responsible for the crucifixion of Jesus. Have you heard the term "Christ killers"?

One can easily see from these verses and others in the Book of John that the author looked upon Jews as the main enemy of Jesus and the primary force behind his demise. Most important of all, in John 8:44 Jesus himself attacks the Jews by saying, "Ye are of your father the devil, and the lusts of your father ye will do." Imagine saying that the Jews are "of your father the Devil" !! You know there are plenty of Christians that did that and some still do to Jews.
Other verses also contribute to the anti-Semitic onslaught. Not to be outdone, Paul adds to the hammering by saying in 1 Thess. 2:15 that the Jews killed both the Lord Jesus and their own prophets. According to Acts 9:23 and 13:50 the Jews are accused of persecuting Paul and his followers: "After many days were fulfilled, the Jews took counsel to kill him [Paul]" and "The Jews stirred up the devout and honorable women, and the chief men of the city, and raised persecution against Paul and Barnabas, and expelled them." Even Peter enters the anti-Semitic foray by accusing the Jews of crucifying Jesus (Acts 4:10 and 5:30).
And so on...

As far as Hinduism, that along with every other mythology based religion is derived from ancient Babylonian mythology... the same with some supposed christian religions like the Roman Catholicism, which is also derived from ancient Babylonian mythology.

And stories like creation of the world, garden of Eden, tree of life, big flood etc are originals?