As shocking as it may be, this is not the first time that I have been asked this question.
Yahweh and Satan are both quite lovely entities, who share some of the most magnificent qualities of each other. They are both filled with a great passion that seems to bust forth from them in every action that they take; the violent rage towards wrongdoing, the great love of their servants, and the pureness of will are inherent in every aspect of them.
They parallel each other in certain ways, and the thought of being able to serve both may seem overwhelmingly lovely at times.
However, it is not appropriate to worship Satan alongside Yahweh.
Yahweh is a jealous God. He will not be worshiped below or beside another.
In more traditional lore, you may find yourself now at odds with Satan, as well. You have set Him as equal to Yahweh, and in doing so, you have broken a promise to Yahweh and made Him the further cause of His beloved’s agony.
It seems likely to create a circle of discontent.
That being said, it is entirely appropriate to love both Yahweh and Satan. It is entirely appropriate to appreciate their lore and their entwined legacies. It is certainly appropriate to see greatness and beauty in them both, and to learn from their teachings. You need not choose to hate one because of your love for another.