A religion needs structure and ritual, it takes a few miracles to make his presence felt, but then he needs priests and missionaries, all of whom should receive good health and extended youth and life as a matter of course.
It's important to keep the channel for blessings only through the religion and through its priests. A bit of liberal smiting will keep the church hierarchy in line as some level of corruption is inevitable. Support the hierarchy though, high priests should be chosen on seniority as living to a grand old age is one of the gifts of Bob, so the older the person the more blessed they are. If the eldest wasn't chosen by Bob, they wouldn't have lived long enough to achieve the position.
Blessing and healing should not be given out for free outside the confines of the religion and its environs. This is important to prevent people demanding their right to a blessing and moaning when it's not given, rather than going through the ritual required to gain forgiveness and achieve purity first.
Healing springs, springs of youth, etc. should only be within the confines of temples placed in awkward locations. Pilgrimage is important, the gift of Bob should not be easy to obtain. Offerings, donations, and prayer are also important. People seeking the gifts of Bob need to jump through hoops, it needs to be an event, a palaver. They need to spend a week in repentance and prayer, bathing in holy waters and fasting, and only then will the grace of Bob be given.
Arbitrary rules should be put into place as a badge of membership of the religion. It's important that people have a badge that's visible to others to say who they are. Consider the various rules that some of the big religions have regarding clothes, headgear and haircuts as examples of this.
Destroying the temples of a few major religions with fire from the skies in the middle of major festival services never goes amiss. Killing their priests but not the people in the event also wouldn't do any harm.