Yep, I would agree with that. I would suggest though that if you get the chance , it's a book worth reading.
I think they also had a real opportunity to have done things differently.
The original 1922 Free State constitution was broadly secular and enshrined freedom of religion in the form of prohibition of discrimination on the grounds of religion. This would seem very reasonable by modern standards. It is the 1937 DeValera constitution that is so problematic - with religion writ large. And I think he got it tragically wrong in trying to pander to two conflicting issues - being seen to be suitably 'catholic' to satisfy the conservative catholic likely majority (conservative catholic note, not catholic), but also not to frighten the protestant minority which would have happened had catholicism become a state religion.
And the constitution did this by first and foremost indicating primacy of catholicism but then (presumably to protect the protestant minority) effectively delegating control on religious matters outside the control of the state (and far beyond as it proved) not just to the protestant church and their rather small membership, but also to the catholic church. And in doing so created a hugely powerful religious block acting de facto outside the control of the state but in a manner seemingly supported by the constitution.
Such a lost opportunity as Ireland from 1922 could have developed as a modern secular state.