Why? Because usually being converts themselves they are well aware that the majority in Catholic and Orthodox churches are lost, trusting that their baptism made them children of God, and with the intercession of their church they will attain Heaven.
In contrast, evangelicals are not so much attempting to convert you to their church but to Christ, via heart-felt contrite repentant faith in the Lord Jesus to save you on His account, as damned and destitute sinners, as in Scripture. Which results in following the Lord.
One who has not had the transformative events of being born again with its basic profound changes in heart and life then they need their "day of salvation."
And in contrast to evangelicals Russian Orthodox overall show very little commitment, which is a testimony to their lost condition.
Despite the opening of more churches and official and media support for Christianity in Russia in recent years, the share of Russians attending Christmas services was less than two percent of the Russian population – a decline by more than half over the last eight years. Russian officials and hierarchs of the Russian Orthodox Church routinely claim that 80 percent of more of the Russian people identify as Orthodox Christians, and polls show that almost that many acknowledge that they do, although they indicate that they only attend church and follow its rituals from time to time. - Window on Eurasia -- New Series: Share of Russians Taking Part in Christmas Services has Fallen by Over Half Since 2010
Pew reports:
Orthodox Christians make up an estimated 57% of Central and Eastern Europe’s total population, including large majorities in 10 of the 18 countries surveyed, from Russia to Serbia to Greece...But their orthodoxy does not necessarily translate into high levels of practice, or “orthopraxy” (derived from the Greek for “action”). For instance, a median of fewer than one-third of Orthodox Christians in the region report praying daily and fasting during holy times such as Lent. - Orthodox Christians in Europe more likely to believe than practice their religion
- https://windowoneurasia2.blogspot.com/2018/01/share-of-russians-taking-part-in.html