In a 1995 lecture on Exodus 5, Dennis Prager says: It is difficult if not impossible to love G-d and to love humanity at the same time.
If you really love people, then you so cry for their pain that it’s difficult to love G-d. And if you are really intoxicated with love of G-d, it can come at the price of feeling the pain of human beings. If you really feel their pain, it will have to raise questions about G-d.
There have been people who loved G-d and could torture people because they were able to separate the two. It’s when you really feel for people that the questions about G-d arise.
If you only love man, you will end up with moral chaos because where does good and evil come from if you don’t love G-d?
If you only love G-d, you will end up with moral chaos because you will not care about the suffering of humanity.