Christian as synonym for good

Somewhere along the line, some people became so arrogant as to think that Christianity had the monopoly on being good, therefore any work toward spreading good or helping people was considered Christian.

If you feed the poor or help the sick, you're being Christian, even if you're an atheist, they say.

A bit of linguistic foolishness that manages the miracle of annoying both Christians and atheists in equal measure.*

For starts, we already have the word "good". It's a fine word, and doesn't need replacing with a term that means something entirely different.

Secondly, Christians feel that such usage is arrogant. It's not our place to judge whether someone is truly Christlike or not. (See Luke 18:18-25, where Christ reprimands the rich man by saying "No one is good but God alone.")

Thirdly, it saps all meaning from the word. If I say that I am a Christian, I'm telling you something about myself. You have an idea of what some of my basic beliefs are, and how I am likely to respond to certain situations. If "Christian" merely means "good", at most all I'm telling you is that in my opinion I'm a swell guy.

*The difference is that atheists see it as arrogance emanating from those damn Christians, whereas Christians see it coming from those who wish to subtly undermine their religion by replacing it with vaguely-defined well-wishing (much in the same way Christmas was transformed into a secular holiday based on consumerism).

(Note: I'm atheistic agnostic.)

Firstly, describe Christian as someone who follows or believes in the teachings of Jesus Christ. Now, Jesus Christ taught compassion: feeding the poor and helping the sick.

Therefore, when you feed the poor or help the sick you are carrying out actions preached by Jesus Christ. By the definition I gave above, you're Christian. you're also Islamic and Buddhist.

You're not following/believing all that Christ taught but your actions are Christian in the same way you're Faustian if you sacrifice spiritual values for material gains. It doesn't mean you believe everything Jesus (or Faust) said.