Whether from a partially successful / limited Belgian Revolution with only the region of Wallonia forming an ATL Belgium (later possibly uniting with France) or some other event, what is the effect of Flanders remaining part of the Netherlands?
Not true, certainly not after 1848.As Catholics, the Flemish are second class citizens in the Netherlands just as much as they are in Belgium as Dutch-speakers.
Not true, certainly not after 1848.
Nominally that wasn't true since 1795, however Catholic emancipation lasted until the 1960's. In 1848 there was freedom of education, though funding wasn't addressed yet, public and private (Catholic or Protestant mostly) were only funded equally after 1917 (when every adult Dutch man was allowed to vote).
It's probably true, that the Pillarization prolonged it a bit, but the emancipation definitely was not finished in 1848.
As Catholics, the Flemish are second class citizens in the Netherlands just as much as they are in Belgium as Dutch-speakers.
Thereby allowing them to minorly oppress the local catholicsNot if Flanders never remains under the Spanish in the first place. Without Spanish oppression and religious persecution, the southern Netherlands are likely every bit as Protestant as the northern (Antwerp and Brussels were both relatively major Protestant centers), and though there's no precise demographics, there's record of very large numbers of numbers of Protestants and even some Catholics fleeing north after the war.