A: "Honest doubt is something that all truthseekers wrestle with. The Urantia Book teaches that "The believer has only one battle, and that is against doubt — unbelief."
The entire quote is:
(159:3.8) The world is filled with hungry souls who famish in the very presence of the bread of life; men die searching for the very God who lives within them. Men seek for the treasures of the kingdom with yearning hearts and weary feet when they are all within the immediate grasp of living faith. Faith is to religion what sails are to a ship; it is an addition of power, not an added burden of life. There is but one struggle for those who enter the kingdom, and that is to fight the good fight of faith. The believer has only one battle, and that is against doubt — unbelief.
If you want to be a "true believer," the best thing to do is to cultivate your faith—faith in God, faith in the triumph of goodness, truth and beauty. If you have a desire to know, a desire to believe, then ask God to clear the waters for you—to show you his truth. Even if it all seems very "deep," there are shallow waters into which you can wade before plunging off the precipice of total faith. You can take small steps of faith, and when those are rewarded in your experience, you'll be strengthened to take larger and larger steps until your faith becomes more like certainty. God wants you to believe in him, to trust him wholly. And he'll help you when you ask him.
One of our gifts from God is that we are given logical minds. It's not intended that we have faith and believe in anything that doesn't also make logical sense to us, so one way to develop faith is by testing the facts one's basing their faith upon, see if they're sound, if they make consistent logical sense.
God indwells your mind, and is your constant companion through this life. He is accessible to you at any moment. The Urantia Book calls this divine gift the Thought Adjuster . When we become aware of his literal presence with us, we can be cheered and more ready to step out in faith, knowing that we never walk alone.
Since you are a self-described "doubting Thomas," I think you might enjoy reading about this famous apostle. Click HERE to read about Thomas and how he overcame his lifelong doubt."