Why non-belivers think Christians are all the same?

i definitely do not agree with most Christan's who happen to be white(NotreDame) people, i have a more deeper understanding of compion unlike most christians in america. I feel they don't really understand differences and the value of a dollar. One Christian guy just told me to go to hell, after i asked could someone pray for me. I know we read the same Bible and everything, but obviously the black christian world are more realistic and completely aware about the not so nice world. I found we understand the Bible a little better because we, ourselves face those crises ourselves. When the Bible speaks of suffering and lost, we are more subjected to feel the Bible, unlike conservatives in America who happen to be white. I hope you're not bothered for me calling you white. We get called black all the time, so i hope i'm not offending anyone.