It sounds to me like you are observing there are (at least) two different kinds of christianity. One is the one that concentrates on the divinity of Jesus, and the fact he 'died for your sins'. They are heavy into the sacrifice of jesus for their sins.
Then, there are the ones that look at what they perceive to be the message of Jesus (depending on which book). They will look the message of jesus about 'what ever you do to the least of these, you do to me' to heart, and try to be kind, chartable, and good. The second is method is much more in line with the Jewish roots of Christianity.