They didnt have a Marxist ideology because they werent a Marxist organisation, Ireland wasnt a Marxist country, the people simply werent Marxists. Any attempt to graft that on artificially from the top was an exercise in rhetoric only, as other examples have shown . Despite that even the more conservative catholic members were more than happy to engage in all manner of social agitation and left wing projects. There was nothing to stop more left leaning initiatives going forward and being built upon. Eire Nua for example was being revised and added to with a lot more left wing orientation. A natural organic expression of what the grass roots were comfortable with and could identify with.
When Adams and his crew were seizing power they immediately set about using extreme leftism as a means to undermine the republican leadership, to portray them as soft on every issue and to alienate them to the utmost. All manner of hairy social worker type weirdoes started to gain prominence from nowhere due to their marxist zeal...many of them are landlords in Belfast now. OBradiagh was reduced at one point to having to explain to them that even in the DDR some forms of private property ownership and profit were permitted. That was in response to motions calling for the abolition of all private property, utterly rubbish stuff. An ard feis I attended in the mid 80s even had a motion calling on the Ard feis to recognise Albania..thats right mid 1980s Albania...as the only true socialist state in the world. From the same cumann that was proposing the end to abstentionism.
Fucking Albania for christs sake.
But a year later after it had served its purpose this was mostly gone. McGuinness pronounced socialism wasnt on the agenda. A mere 12 months later. It was nothing more than an internal ruse.
Politics wise Adams and McGuiness are as thick as 2 short planks. They dont even understand Marxism much less believe in it.
What the provos ended up with was absolutely no ideology at all, not even a very basic republican one. The only ideology was the leaders strategy. Which, of course, was a big secret that nobody was allowed to know. Adams and McGuinness completely depoliticised the provos, they expunged it of any beliefs . They came to believe in absolutely nothing at all. Absolutely nothing. They have a leadership that doesnt have a position on anything at all, pretty much.
The IRSPs Marxism was cheifly built around the personality cult of Costello, a bit of a simplification but largely true. Once he was killed the impetus behind it withered and died. Like the sticks its all nice sounding but how exactly applicable was it to the Irish people ? How did they identify with it ? How did they relate to it or understand it ? was it not just the ideology of the few partially grafted onto the militarism of the majority ?