Christians claim to be tutored by their just Jesus. People have always been less then perfect. That’s why we look up to Jesus as role model. If every one that claimed Jesus acted perfectly holy as Jesus, I’d say yes. But Christianity is humans trying to make Jesus fit into their picture. It does not exclude nor include based only on a superficial label.
Is it just to make people who don’t believe in Jesus to believe in Jesus? No
Is it just to say love your neighbor as yourself? No, that’s undue favor.
Is it just to kill someone for lying? Depends, yet Christianity demands forgiveness. That’s not justice.
But regards to Jesus, it’s just to get mercy once you are capable of giving mercy.
Is that black and white enough for your question