Is it a condition for one who travels to lands of disbelief to be inherently knowledgeable to safeguard his religion, or is the availability of academic resources (books, internet) sufficient for him to repel doubts?

Scholars stipulate, for the permissibility of traveling to disbelieving lands, safety from temptation (fitna) and the ability to openly practice religious rituals. Knowledge is considered a condition for safety from temptation, because temptation is warded off by knowledge and insight. Therefore, traveling to disbelieving lands with little knowledge and insight is a great danger, as polytheism and sins are widespread there. The type of knowledge required varies according to the state of the country; each country has knowledge appropriate for it. General knowledge, along with the ability to acquire the necessary details, suffices for someone whose faith is strong and whose resolve is sound. A person is insightful concerning himself; so, whenever one feels weak in resisting doubts, then the condition of safety from temptation has been lost.