A person who truly does believe that "God is true," will have more peace, joy, and liberty in his earthly life.
Jesus faced temptation and trial with the word of God. I have certainly learned that more Bible study and application of scripture in my life would make for a more faithful front to the enemy.
Right now, in the middle of all this confusion and uncertainty, you can feel saved!
If our trust is in the wrong place, we will have fear because we have trusted in earthly things rather than God.