There are many people calling themselves Christians, who believe that at its core Christianity is all about doing good and helping the poor, downtrodden and abused. They have no time for the idea that people need to be saved from God's judgment. And in their view, although Jesus' death on the cross served in some way to demonstrate God's love, it was not a redemptive sacrifice for sins.
It is quite right for genuine Christians to vigorously oppose this belief system. Such views are