Choose the word most similar in meaning to the word 'credulity', as used in the passage.

Directions: Read the following passage carefully and select the most suitable answer according to the underlined word per corresponding number in the passage.

When we examine the opinions of men, we find that nothing is more uncommon, than common sense; or, in other words, they lack judgment to discover plain truths, or to reject absurdities, and palpable contradictions.  We have an example of this in Theology, a system revered in all countries by a great number of men; an object regarded by them as most important, and indispensable to happiness.  An examination of the principles upon which this pretended system is founded, forces us to acknowledge, that these principles are only suppositions, imagined by ignorance, propagated by enthusiasm or knavery, adopted by timid credulity, preserved by custom which never reasons, and revered solely because not understood.
In all parts of our globe, fanatics have cut each other's throats, publicly burnt each other, committed without a scruple and even as a duty, the greatest crimes, and shed torrents of blood. What for? To strengthen, support, or propagate the impertinent conjectures of some enthusiasts, or to give validity to the cheats or impostors, in the name of a being, who exists only in their imagination, and who has made himself known only by the ravages, disputes, and follies, he has caused.

Thus, man has remained a slave without courage, fearing to reason, and unable to extricate himself from the labyrinth, in which he has been wandering.  He believes himself forced under the yoke of his gods, known to him only by the fabulous accounts given by his ministers, who, after binding each unhappy mortal in the chains of prejudice, remain his masters, or else abandon him defenseless to the absolute power of tyrants, no less terrible than the gods, of whom they are the representatives.