Its seems obvious that the term "Christian" in fact refers to a set of religions that seem to have little relation to each other.
The loudest and most politically powerful at the moment (in America) are the rightwing nuts who support war, hate gays & lesbians, etc..... These people call themeselves Christians.
But "Christian" also refers to such groups as the Quakers... wonderful people with deep faith in peace, love, acceptance, and non-violence.
Though both groups claim the title "Christian", its hard to imagine two religions more different. The Quakers have more in common with certain Buddhists, Jains, Sufis, etc.... than with the Christian Right in America.
All of which is to say, I tend to be fast and loose with the term.... often neglecting to cite the inspiring example set by Christian groups such as the Quakers.
Ahh, the perils of language and opinion.