I don’t think a church can survive with ministers admitting to having doubts about their faiths. Religions (in general) rely so much on authoritarianism that any doubt is a sign of weakness.
I agree, especially if they make their views public. However, if a member of the congregation asks to be counciled by the minister about his/her doubts and the minister admits his/her own helps the person move toward atheism, the person may feel closer to the minister and actually become a stronger member. Who knows, after a while the whole church could become non-believers.
..and we can all sing kumbaya together!