Do Muslims, Jews, and Christians worship the same God?

What is the relationship between Christianity and other “Abrahamic faith traditions”? Is Abraham really the father of Judaism, Islam, and Christianity, and if so, does this mean that each of these religions are legitimate ways to God? What are we to do with Abraham himself and with the other Old Testament patriarchs? Since they didn’t have explicit faith in Christ, how can Jesus be the only way of salvation? White Horse Inn: know what you believe and why you believe it!