Yes, he was an apostle, by tradition the earliest missionary to Syria and India, but you want to have better faith than him. But now doubt has been rehabilitated. It is spiritually healthy to have doubt, even to harbour big doubts. The liberal, mainline church is bully on doubt. Newspeak, the opposite of belief currently is no longer doubt, but unbelief.
Evangelical thinkers are right, unbelief is different than doubt.
In doubt you accept the basic premises of the Christian faith and life, but have concerns and challenges about the steps along the way. In unbelief, one does not accept the basic premises and lives and thinks in the absence of Christian principles, if not in hostility to them. Those of us who are willing to doubt along with Thomas are in the minority, but it is a privileged status. The answer of many Christians to squash the smallest doubts for fear the dam of unbelief will break and drown us is, frankly, unfaithful.