Why are so many atheists, especially in Russia, becoming Jehovah's Witnesses?

Because they're truth seekers ☺

I doubt that.

As the Virgin Mary has told us, it is important to work for the proper consecration of Russia to her Immaculate Heart. As of yet, the consecration has not been properly performed.

There aren't.

Russia used to be a very religious country. Why they chose Jehovah's witness I have no clue unless it's because they will go to people's homes and talk to them.

Then they were never atheist.

Jehovah Witness are good deceiver.

"Especially in Russia?" 75% of the Russian population are Orthodox Christians. There's a small percentage of atheists in Russia.

Even if some did convert - they would probably convert to the Orthodox religion or Islam. Jehovah's Witnesses are a late 18th century cult with no religious significance in any country.

JWs are standing at street corners everywhere.

From the frying pan into the fire ...