I was raised in St. Paul, Minnesota, from kindergarden through Junior High School, and one of the oddities I picked up is the tendency to end a sentence with a preposition. Whenever I say, “Do you want to go with?” my California-raised wife smiles. But maybe this is why Paul’s use of verbal compounds formed with σύν sounds so natural.

When you have one preposition and two objects, the writer is telling you, in a very nuanced way, that you should be viewing the two objects as a single entity. Not identical, but in some way functioning as one. So when a single preposition governs both "God" and "Christ," what is Paul saying?