We already know how to make Coke and marshmallows and scaling that up to a planetary level is just a matter of time and technology. So Coke and Marshmallow planets may not be exceptional at all. Someone just has to want to do it. No God required at all.
Changing tack a little ... Humans, being semi-intelligent designers, have an amazing capacity for underestimating the complexity of our planet, biology and ecology. We are speedily destroying ecosystems on a global scale. I don't think advanced human civilizations will persist long enough to get to the point where we can terraform our own planet by design, let alone new worlds. We are very rapidly destroying the natural ecology of our planet at an ever increasing rate. Mostly, this is driven by human population growth and economic systems that don't listen to scientific evidence. I don't see us ever getting to the point of making Coca-cola oceans, but we are doing a fine job of over fishing and polluting our oceans with toxic waste.