re: Putin is a Catholic and Christian

The Eastern Orthodox Church and the Roman Catholic Church split way back in 1054.

The biggest differences are that the Orthodox Church does not recognize the Pope, Orthodox priests can marry and have families, and they cross themselves U/D/R/L instead of U/D/L/R.

Also, there is no reciprocity for communion in either direction. Only Orthodox can receive it in an Orthodox church and they can't receive it anywhere else.