Where's Waldo Wednesday: Keeping the Union Balls in the Air

So for my devotions this morning I used a prayer from Calvin and needed to pause to consider what I was requesting (I guess this an argument against forms). Calvin wrote (in French, of course):

Grant, Almighty God, that since thou hast deigned in thy mercy to gather us to thy Church, and to enclose us within the boundaries of thy word, by which thou preserveth us in the true and right worship of thy majesty, O grant that we may continue contended in this obedience to thee; and though Satan may, in many ways, attempt to draw us here and there, and we be also ourselves by nature inclined to evil, O grant, that being confirmed in faith and united to thee by that sacred bond, we may be constantly abide under the restraint of thy word, and thus cleave to Christ thine only begotten Son who has joined us forever to himself, and that we may never by any means turn aside from thee, but be, on the contrary, confirmed in the faith of his gospel, until at length he will receive us all into his kingdom. (Devotions and Prayers of John Calvin, p. 15)

Here is my confusion:

1) Is being united to God different from union with Christ? In this prayer Calvin speaks of union to God, Almighty before union with Christ.

2) If we are united to Christ how do we cleave to him? Doesn’t union suggest a oneness that exists independent of cleaving, such as that between a husband and wife?

3) If we are united to Christ how would we turn aside? Wouldn’t Christ be there when we turned since he is united to us?

My intention is not to mock union. It is to show that its usage is not altogether clear or free of confusion unless we have a map and glossary. Union advocates would really help us out if they could identify the balls.