Being that planets don't have their own propulsion systems, where does the energy come from to produce so called Milankovitch cycles?

Well I agree it does have some holes, but I think the inclination is the main effect, the propulsion is gravity, have you never seen a spinning top wobbling on it's axis, also there are the gravitational effects of the other planets.

MAXX the motion of our Earth was set up when it was created, it would take a force to change it, no astronomical body has a perfectly circular orbit they are all elliptical to some extent, and the axis angle is common nearly all planets have some angle, and the wobble is quite normal too.

Actually our orbit is deteriorating we are moving away from the sun at 15cm per year, just as the moon is moving away from us, it is to do with tidal forces.

The energy comes from the original rotational energy that the cloud of gas which collapsed to form the solar system had. And that energy is the angular momentum which was conserved and transferred eventually to all objects in the solar systems which formed.

The Milankovitch Cycles are simply perterbations to the orbit and rotation of the Earth over many thousands of years.

The energy of the orbits do not change. The axis if rhe Earths's rotation wobbles about every couple of dozen thousands of years, It's eliptical orbit precesses.

Because of the differences in reflectivity/absorbtion of sunlight by land/ocean, the energy of the Sun is more/less retained by the Earth.

It is only necessary for the total energy of the solar system to remain constant. One planet can swap energy with another without breaking any physical laws.

Think of the man-made satellites that gain energy by sling-shotting round a planet. The satellite gains energy but the planet loses it. It is all done by gravity.

Let's see if I can come up with an analogy for you.

Imagine a bunch of people dancing around in circles. And let's say they're all only putting enough effort into their dancing to overcome friction and keep going in the same circle they're in. If they never did anything else, they'd just keep going around and around in the same circles.

And, just so they can interact without having to be close enough to run into each other, they all have long cords tied to their wrists. Occasionally, they're grabbing each other's cords. Sometimes, they just pull each other a little closer, and sometimes they grab release in such a way that another dancer is flung a little further away. But, in any case, those dancers will not be going in the perfect circles you'd expect from the energy they are putting into dancing, because they keep tugging each other around.

And, from one of your comments, you seem to think you'd need a really large orbital change to cause a large climate change. You wouldn't, both because the Earth is a pretty delicately-balanced system (so that even a small change can make a big difference), and because of feedbacks.

It doesn't take extra energy, it takes resonances between the major gravitation sources in the solar system - same reason Near Earth objects have such weird looking orbits.For the same reason, there is no general solution to the orbital three body problem.

The big bang, approximately 13.798 ± 0.037 billion years ago. [1]

Young earth creationist [2] like yourself would not be able to accept Milankovitch cycles [1], as the time scale of the Milankovitch cycles exceeds the age in their creation myths. Therefore in your world, unlike the normal world, it is again the science that is the myth.

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The forces set in motion by our creator.

gravity and inertia.