Christianity is said to be the product of esav, while islam is said to be the result of Ishmael. Esav was the son of Isaac, and the birthright was supposed to be his. Yet esav spurned the teachings of his father and rejected G-d, parting from the ways of Abraham; and he went his own way, while Jacob, his brother, became Israel. Ishmael, on the other hand, was banished from Abraham's household, that he should be removed from Isaac and not inherit the Heritage of Israel. While esav mocked G-d, rejecting what was his and doing whatever he wanted, Ishmael was never really born into the role, but was instead directed into the wilderness, away from Abraham and Isaac. Likewise, while christianity is a rejection of G-d that seeks to replace Israel, islam is tied to Israel by the roots of Abraham, but it is of no importance, and is merely a side issue.

Islam was formed by a merchant man, mohammed, who had many connections with the Jews who lived in arabia, and adopted a mix of ideas to form his own religion and unite his countrymen. And islam was created upon the failures of Israel and christianity, as it was said that islam had come to replace Judaism and christianity and correct their mistakes. As long as Israel retains its foolish thoughts and remains a religion, then I think islam and christianity serve their purpose, for they mock Israel in the time of its foolishness. However, when Israel returns to G-d and becomes a nation of G-d, following His Laws and upholding His Torah, then all the religions won't matter, and will have been a thing of the past--for their deceit will have been exposed and their corruption would not be ignored.

I have nothing to say about islam, as there is no need to preserve the foul state of things. Israel will become a nation of G-d and islam will fade away like dust.