I think rationalism is kind of like stoicism (both philosophies I like and try to practice, though I don't really "identify" as either a rationalist or a stoic)
They are absolutely different philosophies. Ethically, Stoicism (similar to Christian ethics) is virtue ethics system, rationalists/Yudkowskyans are utilitarian consequentialists. Stoicism is focused on individual and it teaches how individuals can lead a virtuous life. One of the principles is Hierocles’ Concentric Circles (similar to Catholic subsidiarity) where responsibility flows from virtuous individual to virtuous broader society. Yudkowskyian rationalists have completely opposite system, they ground their morality in "greater good" of Effective Altruism, where they obsess about macro level and maximizing utility for maximum number of conscious beings including those not yet born.
Rationalists are reductionist materialists/physicalists. The universe is dead, intelligence is emergent property of unthinking universal wavefunction, morality is accident of evolutionary engineering of biological computers that gave birth to human intelligence. Stoics believed that the universe has telos, that it is a thinking organism and by being virtuous you align with this universal telos - it is similar to Thomistics natural law philosophy.
Those two systems could not be more different. In fact it is one of my main criticism of Rationalists.
The problem is with the wife and husband to be. If they are both Catholics, for a valid catholic marriage they need to be married by a properly ordained catholic priest. If two Catholics get married by protestant pastor, their marriage is invalid from catholic perspective. This is an interesting situation - for instance if there are two atheists who married in front of Elvis and who later convert to Catholicism, their marriage is considered as valid natural marriage and it is automatically promoted to sacramental marriage upon baptism. If one of them was atheist but the second one was baptized catholic in apostasy and they both married in front of Elvis, then their marriage is null and void from catholic perspective, they are just living in concubinage as lovers. They need to remarry right after baptism of the atheist and after the apostate goes through general confession (the special confession taking into account his whole life).
This seems strange, but from the standpoint of Catholic Church the Catholics as soon as you are baptized you are bound by the canon law for life. You agree that the Church is providing the legal structure to your life. Protestants or atheists did not do that, so they are not obligated to follow it.
They are not only different, they are opposite to each other in all ways that matter. They are bitter enemies.
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