You really should take a closer look at this map of publication links between scientific disciplines. Here’s the description:

This map was constructed by sorting roughly 800,000 published papers into 776 different scientific paradigms (shown as pale circular nodes) based on how often the papers were cited together by authors of other papers. Links (curved black lines) were made between the paradigms that shared papers, then treated as rubber bands, holding similar paradigms nearer one another when a physical simulation forced every paradigm to repel every other; thus the layout derives directly from the data. Larger paradigms have more papers; node proximity and darker links indicate how many papers are shared between two paradigms. Flowing labels list common words unique to each paradigm, large labels general areas of scientific inquiry.

There’s an amazingly detailed version of the map available at Seed, and it visualizes an important point: all of the sciences are interconnected, sometimes very indirectly, but the contacts are there. When some clueless ideologue (like Michael Egnor, who is up to the same old tricks again) tries to split off a major subset and pretend it is irrelevant, he has to ignore the breadth of science.