But, there are also clearly some holy people in Roman Catholicism too. They loved God with their whole heart and soul and mind and strrength; and they loved their neighbor as themselves.
There is a clear sense of disordered spirituality in the Catholic Church: for some reason, torturing oneself is considered 'holy.' Case in point: Opus Dei, favoured by John Paul II. Many of it's members wear hairshirts, which used to be a rought cloth worn in penance, but changed in the Medieval times to be a spiked metal belt and this became known as a "cilice." There's also the practice of flagellation; Dominic beat himself with a metal chain.
There is an overbearing idea in Catholicism that pain is holy. Now, there is a difference between true forms of penance, like fasting, and false ones, such as inflicting pain. Besides being psychologically unhealthy, false penance is aggressive against oneself, but passive ones are natural and encouraged by Christ himself.
Take this quotation from Josemaira Escriva, in his book The Way, 208: "Let us bless pain. Love pain. Sanctify pain... Glorify pain!"
Belonging to one denomination or another is not on the list.
But Orthodoxy is not just another denomination, it is the indivisible Church of Christ. The Fathers, preserving the doctrine of the Apostles, hold that there is no salvation outside the Church: we can never, therefore, be sure of the salvation of those without the Church, no matter how good or holy they may seem. Of course, the Lord saves whomever he chooses, but we certainly can never be sure of their salvation as when the Church proclaims saints.
PS. JP II had devotion to an Orthodox saint, I believe. This and the fact that St. Gregory Palamas is in the Catholic calendar would mean then, logically, that submission to the Pontifex Romanus is certainly not necessary for salvation and the Catholic Church has contradicted itself.