The Test of Great Temptations in Our Time

The struggle between now and the coming of Moshiach will be spiritual, where each one of us will have to fight, to hold on to our faith amongst a sea of atheism and agnosticism.
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Rebbe Nachman of Breslev foresaw this spiritual struggle 200 years ago; his disciple, Rebbe Nathan of Breslev, wrote (Sichos HaRan, 35):

Rebbe Nachman said, "A great wave of atheism is coming to the world:
It has already been predicted, that there will be great temptations before Moshiach’s coming, many will purify themselves and be refined, and make themselves shining white" in faith.

Fortunate indeed, is one who resists these temptations, and remains firm in his belief. He will be worthy of all the good promised to us, by the prophets and sages of old.
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Knowing full well that this has already been predicted, it would seem ridiculous for one to succumb to any temptation and to abandon his beliefs. It would seem obvious, that every Jew would have enough intelligence, to remain firm. But still it is a great trial.

Many will fall away, and for this reason it is written that, "the wicked will be evil."

The Rebbe said, "Still, I am revealing this for the sake of the few faithful, who will remain strong in their belief. They will certainly have great conflicts. But when they see, that this has already been predicted, it will give them additional strength and encouragement."