Woah woah woah, hold up. Geologist here. The effects of Milankovitch cyclicity and tectonics on climate are entirely mediated through the atmosphere.
For instance, when oceans change, such as el nino, la nina, reversals of enduring currents, or even new connections between seas due to tectonic transformations, that is properly a cause of climate change -- regardless of how much that change is, in fine, mediated by the atmosphere. Atmospheric changes are demonstrably not the only, nor the ultimate causes, of climate change.