Bringing this out of a thread ...
You've described the false dichotomy perfectly. You've only given two false choices.
The first false choice: "...become less in his own eyes..."
Precisely so--this is the goal of spiritual maturity in Calvinism, constantly "making yourself smaller." I don't know why people think this is a good thing, however. Paul doesn't say: "Now stop eating the solid food, and get to the pure milk of the Gospel! Think less! If you ask God to decide who you should marry today, that's a good start, but tomorrow you should ask God to decide the color of your shoelaces! Ask God for every detail of your life!" This treats our entire relationship with God as a transaction. "God, feed me baby food. See how trusting and stupid and helpless I am ... how much this makes me trust you? Look how righteous ..."
The second false choice: "...Christ is his magical wingman."
And here you've presented a willful, arrogant person, who just treats their relationship with God as a transaction, as well. "God, I'll just go do things, and you can get me out of scrapes."
Both of these are straight up lies.
If you want to understand spiritual maturity, look at the examples God actually gave us. The slave who chooses freedom by giving up the things his master has given him, and takes on the responsibility of living. The child who moves from milk to solid food, growing into a mature human.
The correct model is to immerse ourselves in God's character and become like him, but still remain ourselves. Calvinism--right wing progressivism--thinks God wants robotic clones. The progressive left think God wants us to do whatever we desire, just using his power as our own to get there.
The truth is God wants us to desire the things he does--"a man after my own heart"--and then to create, order, love, etc., within that. God wants us to become like him, not to become him, nor to become nothing. God wants an I/thou relationship with a being in his image who reflects his character.
In Calvinism, there is no "thou" to God's "I am." That person just doesn't exist. In the second horn of the false dichotomy (as presented), the "I" of God might as well not exist except as some kind of magical daemon to be called up whenever our power cannot achieve our desires. Again, both of these are just straight up lies.
Another way to put this--God didn't "create for his glory," and self-glorification is not "God's highest goal."
God created out of love, and for relationship--to which we say: "All glory to God." I cannot see how someone reads Genesis, the entire creation narrative, and thinks: "God clearly created to receive glory." God's one and only concern throughout Genesis is creating humans who will relate to him, who will create and order and love. When sin enters the picture, the rest of the book of Genesis is God laying the foundation to retrieve his relationships with humans and his creation /via relationships/.
Anyone who cannot see this is reading Genesis as though they are blind.
Going back to witnessing ... it makes all the difference in the world. What are you asking these people to do, to become? Nothing? Everything? Or a child of God?