A lot of idiotic Freepers believe that, DoodleDawg poop being one of them.
They didn't start the war either. If you're looking for causes of the conflict, you won't find them in why one particular soldier went to war.
See, it's arguments like this which make me think you people are not just unreconstructed Dixiecrats, but actual Democrats -- posers, agent provocateurs, so to speak -- whose real purpose is to convince people that Republicans generally, not just those racist Southerners, are evil to core, never to be trusted, always to be defeated by the enlightened, intelligent and all-feeeeeeeeling loooooooving Democrats!
You make me sick!
The truth of this matter is simple for anyone who wants to understand.
Civil War began as a response to Confederate aggressions, at a time when abolition of slavery in the South was not even on the table, politically, not discussed or advocated by any political party, for fear that it would cause, yes, secession and Civil War.
Of course, many Northerners supported abolition, certainly in their own states, in Western territories and perhaps eventually, even in Southern states.
But they were not, in 1861, willing to fight a war over it.
By 1863, things were much different.
By 1863 the great strategic advantage of freeing millions of Confederate state slaves was hugely obvious to everyone, and so, with Lincoln's Emancipation Proclamation, freedom for slaves did become the war's objective.
Indeed, except for that, peace terms might well have been amicably arranged years before the Confederacy was finally forced to surrender, unconditionally, and so abolish slavery everywhere.
So the answer is no - no one except some lost causes (and they don’t really matter) seriously believed that. And the lost causes only advance as a false narrative.