One has to have faith in order to have a doubt about it. People without faith have no doubts about the faith they don’t have. However, they can have doubts about their lack of faith.
To affirm ones’ faith in the face of doubt is to strengthen one’s faith. This is why the Lord allows us to have doubts. “I believe Lord; help my unbelief!” (Mk 9:24) Such an act of trust in the Lord is actually an expression of love as well. Keep your eyes on your crucified Lord and He will take care of your doubts.
The validity of the sacraments does not depend on the strength of our faith. They are objective realities. The bread and wine become the Body and Blood of Christ—regardless of the strength of our faith—or even the strength of the priest’s faith who consecrates it!
So long as you doubt and don’t absolutely refuse to believe, don’t every hesitate from receiving the sacraments. Let us pray that our faith may daily grow stronger—even if it means dealing with doubts. He and His Church are worth it.
Fr. Vincent Serpa, O.P.