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There are arguments on both side. For Orthodoxy, Catholicism is closer in terms of the theology, sacraments, and the overall belief system. The two agree on most issues where as Protestants deviate significantly with the 5 solae, their views on Mary, etc. However (European) Protestants share a common history and civilisation with Catholic’s, being ex Catholics. And in the case of traditional Lutherans and Anglican’s have a very similar liturgy. On this basis it’s basically 50/50, but with European Protestant churches being now significantly more Liberal than Catholic/Orthodox I would say Catholic and Orthodox people are more similar.
The biggest outliers are of course American Evangelicals with their lack of liturgy, no baptism, independent churches led by pastors in jeans and a checkered shirt, etc.
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