[Skybird]

Yes, all three refer to Abraham and thus are called Abrahamic reliogion. Nevertheless this does not necessarily lead to similiar concepetions of "God". Muhammad added certain changes and manipulations to the existing Abrahamic cult, and btw. since then, his and the Jewish/Christian church's concepts went separate ways, resulting not only in different ideas of what God is, but also to what he authorizes people to do (like the example with death and killing I gave above). Since both christina faith and Islam have their roots it Judaism, all three religions have similiarities and have common intersections, nevertheless the remaining differences are of most vital meaning and make their concepts of God very different things.

Being Christian means being a follower of the Christ of which there has been only one. and the chruch has never been the christ. Thus you can be a member of the church - and be no Christian nevertheless (when ignoring or violating the Christ's teachings).