You wrote: "Sainthood for this man? That's a trick...converting from Christian Othodoxy to Christian Catholicism...and then geting sainthood."
Please learn to read. His parents were originally rationalists. He was baptized a Russian Orthodox but was given little instruction in the ROC. His mother reconciled with the Church FIRST. Then he reconciled later. No "trick" was involved. It's called GRACE.
And don't you mean Orthodox Christianity rather than Christian Orthodoxy? All Orthodox (in a Christian context) are automatically Christian. Likewise all Catholics are automatically Christian. Always keep in mind the words of Bishop Pacianus (died c. 380): "Christ is my first name, and Catholic is my last name."
"Sounds more political than spiritual."
No, actually it doesn't sound that way. If it were political then it would be about power. Gallitizin gave up his chance at power to become a humble priest.
Did you not read the article?
Politically motivated decision. You cannot disprove it. And there is no need to. It's happened many times but sainthood for a political decision seems a bit over the top.