2 Corinthians 4:3
But even if our gospel is veiled, it is veiled to those who are perishing,

The Gospel is hidden from those who are dying in sin. What a tragic and glorious thought.
Is the message of Christ hidden from them on purpose?
Yes. Paul says Satan has blinded them to it with the cares of this world, lest they should receive the light of Christ.
Do you have family or friends that remain in unbelief?
They will not see the truth of the word of God because they do not want too!
We must pray through this veil.
We must bind the darkness.
We must speak against the grip of Satan on them.