38% of Russians are not religious and only 41% are Orthodox.
>The results showed that 47.3% of Russians declared themselves Christians—including 41% Russian Orthodox, 1.5% simply Orthodox or members of non-Russian Orthodox churches, 4.1% unaffiliated Christians, and less than 1% Old Believers, Catholics or Protestants—25% were believers without affiliation to any specific religion, 13% were atheists, 6.5% were Muslims,[k] 1.2% were followers of "traditional religions honouring gods and ancestors" (Rodnovery, other Paganisms, Siberian shamanism and Tengrism), 0.5% were Buddhists, 0.1% were religious Jews and 0.1% were Hindus.[481]https://en.wikipedia.org/wiki/Russia#Demographics15% of Ukrainians are not religious and 72% are Orthodox.
https://en.wikipedia.org/wiki/Religion_in_UkraineIt seems Ukraine does a much better job of maintaining faith and tradition than Russia does. I am baptized Orthodox, and am a believer, but alas, am not a regular churchgoer.
It does come as a surprise, however, the major difference in religiosity between Russia and Ukraine.