Doubt visits every Christian. It visited the disciples who watched Jesus rise from the dead. You are in good company.
The question is not whether doubt shows up, but what you do when it does.
Do not build on sand
If your assurance rests on your performance, it will rise and fall every single day. Good week, feels secure. Bad week, feels lost. That is exhausting, and it is not what God offers.
Build on what was said and done
Assurance rests on three solid things:
- The promise of God. He said whoever comes to Him He will never cast out. God does not bluff.
- The work of Jesus. The cross was not a partial payment. Jesus said, "It is finished."
- The witness of the Spirit. Over time the Holy Spirit gives you a quiet inner confidence that you belong.
When doubt comes anyway
Do not argue with your feelings — they do not respond to reason. Instead, speak the truth back to yourself out loud. Read the promise again. Tell someone in the family. Doubt shrinks fast in company and grows fast in isolation.
And remember: the fact that you care whether you are saved is itself a sign of life. Dead people do not worry about being dead.