Christ does indeed hold all things together because "Through Him all things were made".  According to your like-minded commentators above, since this is from the Nicene Creed, it is unchangeable dogma.  And, indeed, John the Beloved tells us that "all things were made through him, and without him was not anything made that was made." Are things were created through the Logos, God's creative dynamic. So Colossians and Ephesians beautifully express not just theological truths but cosmic truths.  By the way, neither book mentions "stars and planets".  I don't see any more sophistication in your reading of the Scriptures than I do in a fundamentalist's reading.  There are limits to demythologizing the Scriptures.  We should always ask the Holy Spirit's help in understanding the Scriptures.