I can understand that atheists do not believe in God, Jesus and the Holy Spirit. I can also see to some degree whey they don’t believe in what The Bible says. Even as a believer, I know that not every word of The Bible is factually true but that does not mean The Bible does not contain truth; it does, much bigger truth than just the words themselves.
However, more to the intended point of this post, even if I did not believe Jesus existed, was crucified and rose again, I could appreciate the wisdom of the teaching of the man The Bible calls Jesus.
It is not necessary to believe in the person called Jesus to believe that his teaching, as has been passed down to us in the gospels of Luke and the other Disciples, is a good way to live and to treat our fellow human beings, both individually and collectively.
There is nothing wrong with atheism per-se but in running down and railing against Christianity, which seems to be the main although not exclusive target of their ire,some atheists are themselves behaving like a religion, evangelising their cause and trying to get converts. I find a certain irony in this.