Stalin targeted the Chechens and the Ingush,
foreign ethnicities such as Poles,
Germans, and
Koreans were executed in the hundreds of thousands,
Russian Orthodox members, nuns, and priests were executed, their houses of worship destroyed.
Roman Catholics, Buddhists, Jews, Muslims,
1. Not "deportations" but RESETTLEMENTS. For Crimean Tatars, Chechens and Ingush they were obligatory for the acts of genocide against non-Chechen/Ingush/Crimean Tatar citizens during WW2; for Poles they were VOLUNTARY.
And yes, regarding Chechens, Ingush and Crimean Tatars Stalin demonstrated undue leniency: according to war time laws practically all males of a certain age had to be executed, instead they were simply send with their families to live in other parts of the country.
With Poles and West Ukrainians actively engaged in mass murders of each other during German occupation of West Ukraine, the only sensible option to stop mutual hatred was to allow Poles to leave for Poland and to allow West Ukrainians to move from Poland to West Ukraine.
2. Germans were also sent away from the front lines. Unlike US that put all of its people of Japanese ethnicity into the CONCENTRATION CAMPS just because of their ethnicity!
3. Koreans were also RESETTLED, not "deported" to other parts of the USSR to remove them from zone of continuous conflicts in the Far East.
For comparison see example with US Japanese population.
4. Russian Orthodoxy came under repressions as part of LENIN-TROTSKY RED TERROR policy. Stalin not only stopped it, he issued a number of decrees returning the rights and the property to Russian Orthodox Church.
5. Neither of these religions came under repressions.