Is it normal to have doubts about faith?

I think it is. But it might be helpful to think about what you mean by "doubt". Blessed John Henry Newman, a very educated Protestant who slowly converted to the Catholic Faith and eventually became a cardinal, once wrote that "Ten thousand difficulties do not make one doubt." Difficulties, questions, and struggling to accept certain things that the Church teaches are not uncommon or bad. The important thing is being open to learning more and letting God slowly reveal himself to you when you face a difficulty in believing. To actively doubt--to  refuse to believe what the Church teaches--is a problem, but at St. Mark, we like to recognize that each one of us is on our own "journey to L.O.V.E.", as we say in our parish mission statement.

The  Catechism distinguishes between  voluntary and  involuntary doubt in paragraph 2088. While voluntary doubts can easily grow into spiritual blindness, I think involuntary doubts (or "difficulties", to use Cardinal Newman's terms) are not only normal, especially when we are relatively young and still learning about the reasons why the Church teaches certain things, but also an important part of the process of becoming a mature follower of Jesus. Even the disciples struggled with faith, especially St. Thomas. In John 20:24-29, you can read the story of how Jesus, rather than being upset by doubt, addressed Thomas directly and laid his doubts to rest. He wants to do the same for each one of us.

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