But they don't believe in evolution, they believe in theistic evolution, that is, evolution guided by god, which is not really evolution. One of the fundamental aspects of evolution is that it does not require a guider, just chemistry, statistics, and time.
But is it particularly important? Sure, Occam is wildly stropping his leather strap about the statement, but if both explanations agree 100% on the outcomes, and agree 100% of the mechanisms of action, and agree 100% on the observations, why does that matter? Does it harm the Universe in some way to say "$UnspecifiedDeity initiated the big bang" instead of "unknowable unknowns initiated the big bang"?
Let's say I have two clocks. One was created by $UnspecifiedDeity at the beginning of the Universe, and then left to run on it's own. The other evolved naturally from the forces of chemistry, statistics, and time. Both clocks are right. Which is a more reliable clock? Do we learn less about time by examining one over the other? Does it matter of there is a clock maker at all as long as the clock tells the right time?
Honestly, to me it's like Stallman complaining about BSD & MIT licensing. You're attacking people who agree with you in nearly everything when there are so many more that don't agree at all.
It sounds like you are describing a god whose existence is indistinguishable from it's non-existense. How would you ever tell if that god exists? Why should anyone believe in it if you can't tell?
You don't. That's why it requires faith.
The response "But that's not rational!" is not a particularly convincing argument when you're talking about belief systems. Religion isn't supposed to be rational. It's supposed to be spiritual. It's supposed to give believers a sense of community, justice, purpose, and well-being -- even if you're a ditch digger. Rationality is particularly poor at that. Rationality tells you people are selfish, that there is no justice, and that any sense of well-being is probably not derived from reality. Spirituality tells you there is value in trying to overcome that.