Apparently, you are claiming to speak for ALL theists...Theists are obligated by God of Love to love atheists, but not the atheism. The atheists are not obligated, they are free to love or to hate.
I'm pretty sure there are lots of theists who believe in the Theory of Evolution and think your defense of creationism is stupid. I'm pretty sure there are plenty of theists who do not characterize their deity/deities as "the God of Love," which is certainly a limited definition/perspective on who/what deity/deities is/are.
And, I'm pretty sure there are a lot of theists who hate others, for all kinds of reasons. This 'hate the sin but love the sinner' approach is really not at all common in my experience.