What is the best way to deal with factual doubt?

You might also be interested in:

• What can you say to someone who doubts their salvation?
• What are some common myths about doubt?
• Who are some Christians, godly people, who have struggled with doubt in their life?
• What can you say to someone who thinks they've committed too much sin for God to forgive them?
• What can you say to those who don't think God loves them?