Some people must doubt before they’re able to believe. Yet, you can doubt without living a doubtful way of life. Doubt affords you the opportunity to think things through. It’s a way of responding, not a permanent condition. It can be used to pose the question, get an answer, and push for a decision.
If doubt leads to questions, questions lead to answers and the answers are accepted, then doubt has done good work. It is when doubt becomes stubbornness and stubbornness becomes a lifestyle, that doubt harms faith. Don’t settle into doubts, but move on from them to decision and belief. The purpose of doubt is to sharpen the mind, not necessarily change it.