People try to persuade us that the objections against Christianity spring from doubt. The objections against Christianity spring from insubordination, the dislike of obedience, rebellion against all authority. As a result people have hitherto been beating the air in their struggle against objections, because they have fought intellectually with doubt instead of fighting morally with rebellion.
(Soron Kierkegaard cited in Stephen Williams, Revelation and Reconciliation)
Of course the objections spring not just insubordination, but distrust, disordered loves etc. But, intellectual doubt is certainly not the wellspring.