Answers
I have doubts. Does that mean I have no faith?
No. Doubt is not the opposite of faith; indifference is. The father in Mark said both things in one breath — I believe, help my unbelief — and Jesus healed his son anyway. Thomas demanded evidence and was given it rather than scolded. Take your doubts seriously enough to look into them instead of burying them, and say them out loud to God, who is not fragile.
Go and see for yourself
And straightway the father of the child cried out, and said with tears, Lord, I believe; help thou mine unbelief.
Mark 9:24
And of some have compassion, making a difference:
Jude 1:22
Then saith he to Thomas, Reach hither thy finger, and behold my hands; and reach hither thy hand, and thrust it into my side: and be not faithless, but believing.
John 20:27