Most people of all backgrounds normally live their lives based on empathy, reason, and social values, not religious teachings. Religion does not necessaraly mean you must rely on that particular framework to know the difference between right and wrong.
Religious teachings are pretty much the same the world over - morally. However, you will have differing levels of intelligence, interpreting the message. It's no accident that the dumbest morons on the planet (White Christian Nationalists USA) are also beholden to God, Jesus and money-hungry preachers.
I don't think that has ever been the main theological difference. Small sects like Jehovah's Witnesses believe in that idea. But both Orthodox Christians and mainstream Western Christians believe in the Holy Trinity. As far as I can see, the only difference on this point is who gives out the Holy Spirit. I have just had a quick Google and, according to Wikipedia, it seems to be something to do with the Filioque Clause:
Pope Benedict made a trip to Turkey for a meeting with the Patriarch of the Eastern Church in order to open dialogue on these matters a few years ago but i don't think anything came of those talks, nor will they heal the schism of a thousand years anytime soon. The RC has enugh on its plate without opening that can of worms and neither does it have the political clout to summon the diet to resolve such a complex metaphysical paradox. I can handle the idea of the Holy Spirit flowing through the Son of God from the Father as it coincides with pagan ideas on the divine trinity which preceded the advent of Christianity in the British Isles; a major factor in how the religion seeded so fruitfully among the people, even after the Romans left at the start of the 5th century.
The Mail wanging on about a single school 'scrapping' the traditional Easter service will make no difference to Orthodox Christians in the wider world - our village will have the usual ceremony, then process to the Holy Well for the annual dressing ceremony, led by the priest, who happily indulges in a pagan ritual without conflicting his views on the Trinity in the slightest.