> They are conserving what they think the world has been all along.
No, they very clearly aim to change things to conform to what they think it ought to be.
> When you define conservatism as being a status quo a single "leftish" government, makes every conservatist not a non-conservatist and the parties in power conservative.
Well, no, not quite, because the government is still a specific institution in society, not something coterminous with society itself. Those who seek to restrain the government in its attempts to expand its influence into the broader society count as conservatives; those who seek to expand that influence in pursuit of making the broader society conform to doctrinal prescriptions -- regardless of the specific content of their doctrines -- are not.
The left-right spectrum is not a dichotomy between competing dogmas, all of which seek to subjugate society to its rule. If it's anything, it's a dichotomy that celebrates dogmas at one pole and is deeply suspicious of them on the other.
Lumping religious fanatics and nationalists together with genuine conservatives is an error caused by all of these groups having a common arch-enemy during most of the past century. Their alignment is beginning to unravel now.