" And then lets mention: it appears as though genes not only interact with each other, but also that they have multiple functions rather than the old perception (true or not) that each gene did only one thing."
The first part of this is quite true (think of a bacterium as a very complex clock like mess of gears - anything that happens has the potential to affect any other function of the cell), however, the old perception of one gene one thing has been gone out of biology for at least 40 years. The last part of the statement is now widely accepted. It is true that some enzymes are extremely specific in their function, but many are very "loose" such as some that have both proteolytic and esterolytic activities at the same active site.
What the creationist/ID crowd cares about is common descent, which has only been strengthened in the last 145 years.
I taught genetics over 40 years ago. There was no "one gene, one function" perception at that time. The mapping from "function" to "gene" was varied; sometimes one-to-one, sometimes many-to-one, sometimes one-to-many.