No one has never felt the test of the creator. Similarly, if a person has expressed faith, then to prove his faith the test will continue to be with all of us.

The test that comes is to prove the faith of a servant to God. Do we still hope for God and stick to religion or we will run away and turn away from God. Because of the test.

So it is impossible for people who claim to believe in God will live in the world without any test coming from Allah SWT.
Because it has been so.

Allah Ta'ala said

Does the man think that they are left to say: "We have believed," and they are not tested again? And verily We have tested those before them, verily Allah knows those who are truthful, and verily He knows those who lie.
(Surah al-Ankabut: 2-3).