Abramahic Religions

Aside from rooting from Abraham, these three share one thing as well, they are all monotheistic.

Yes, I have tried to find out about these religions as much as I could from the internet. I would like to compare then with one huge tree. While the roots are the same, the branches are not. Each branch has its own principles and teachings and followers and while one branch does not deny the existence of the other (how could they, having the same root) they do feel that each is the best among the three. I would like to know your thoughts on this.

This is a very interesting question. I'm afraid I don't know the answer, except that I think we are worshiping the same God. I'll be looking forward to the replies.

As per Islamic view, Abraham, David, Moses, Jesus and Mohammad were prophet of God. God revealed them his revelations to guide mankind. Some people accepted, some declined, some accepted and later diverted. These religious prophets are emerged as the descendants of Abraham, thats why they are called Abrahamic religions. Quran was the last revelation given to last prophet Mohammad, which agrees with the teachings of previous prophets and holy books given to them. Quran is the last revelation fro God that preserved intact, In which I believe. The concept of God is almost same in Jewish & Islam, but christianity implement the trinity. But we recognize the God the Father is the Allah/Alah/Eloh/Elohim/YHWH/Yehvey. All of them saying salvation and Christian differs much though. Christianity believe in first sin, while others two don't have it.

Indeed they are all the same because the message is the same from one true God; however, during the span of time, there were different messengers sent to spread the true message and last of them being Mohammed (Peace Be Upon Him)