Islam believes in all the prophets of the other two major religions and believe that ishmael and his father Abraham built the holy khaba and that ishmael was the next prophet after Abraham.
If you mean Hazrat Ismaiel, the elder son of Hazrat Abraham (AS), yes. He was a true Muslim, The last Prophet Hazrat Muhammad (SAW) was from his lineage.
NO! There is no documented proof that Mohammad is connected to Ishmael. There is over 2000 years of Mohammad's lineage that cannot be accounted for, for him to be a descendant of Ishmael.
No. The Muslim perspective is that Islam started with Adam, the first man, because Islam is the natural state of a person until he is corrupted by other religions/beliefs/atheism. The Historical perspective is that the first Muslim was Mohammed since it is the Qur'an which forms the basis for Muslim religious practice. Since Adam comes before Ishmael and Mohammed comes after Ishmael, nobody claims Ishmael started Islam. However, Ishmael is commonly cited as being the progenitor of the Arab peoples and the link that Muslims have to Abraham.
Ka'bah
Prophet Muhammad (PBUH) came through the off spring of Prophet Ishmael (or Esmael) while Islam came by start of universe creation. Refer to question below.
The Hebrew civilization most directly contributed to the development of both Christianity and Islam. Abraham was a Hebrew and had two sons Ishmael and Jacob. Islam is from Ishmael's lineage and Christianity is from Jacob's lineage.
If you are talking about the actual religion, then they are connected by the fact that both religions believe in only one God. They are also connected because they both believe in an after life. However, if you are talking about roots and beginnings, then they are connected by the fact that Abraham had two sons, Ishmael and Isaac. The Jews are a descendant of Isaac and the Arabs are descendants of Ishmael which eventually led to the two religions. The argument is who was the chosen son (that started the chosen people of God) Ishmael or Isaac. (Ishmael is older than Isaac)
Both Islam and Christianity originated out of Judaism.
Islam originated from Abraham's son Ishmael.
Ishmael is a character in the Bible who is considered to be the ancestor of the Arab people. He is traditionally seen as a figure of Islam, as Muslims believe that he, along with his father Abraham, built the Kaaba in Mecca.
Sarah (Isaac's Mother) and Hajar (Ishmael's Mother)
Abraham was the father of Ishmael, to whom Arabs trace their ancestry.
Ishmael was the son of Abraham and Hagar (an Egyptian princess). Since G0d made Isaac the heir of Abraham and the next link in the chain that led to Judaism, He commanded Abraham to listen to his wife (Sarah) and send Ishmael away. This was a formal act that dealt with the inheritance and they did maintain contact throughout the years. For example, Ishmael attended and helped with Abraham's funeral, while acknowledging that Isaac was his heir. G0d promised Abraham that Ishmael would be the progenitor of a people that would have the traits that described him. These were the Arabs. When Mohammad invented Islam, he changed some of the Bible stories to involve Ishmael and pretended that he was a full prophet.