Two adult policies

First off, if your church is medium-sized or larger it should have a two-adult policy. If there is only one adult around a child for more than a minute or two, it should be in a "plain sight" situation or in an area where there are security cameras. Large churches already use security cameras for theft prevention. For youth and Sunday School activities, have two adults at every event whenever possible.

For smaller churches, this may not be possible for all events involving children and youth. I would still recommend a two-adult policy for regularly scheduled youth events, more so because the youth are hormone-laden than because the adults are. It's just too easy for a junior high girl to give a young youth group leader a surprise pucker, and for another member of the youth to see just the kiss and not what led up to it. If that kid then tells the preacher what happened, the youth leader's career if not his life is put on hold and possibly ruined. By having a second adult present, it not only deters such behavior but it also makes for another eyewitness to the event. Even small Boy Scout troops manage to have two adults on the scene at all times. For the Scouts, it's a matter of policy.

Expose your church's children to many adults and shower them with love

By exposing the children and youth to many adults, they will notice if a particular adult's behavior stands out as "too affectionate" or otherwise odd. Encourage your children to tell their parents, their Sunday School teachers, their Youth leaders, or the minister if they notice any adult acting way different than most other adults. Concurrently, encourage all adults in the congregation to shower the children with love, time, energy, and, to an appropriate degree, individual attention and physical affection. Sadly, you will have to emphasize that the latter two should be done "in public" so nobody can falsely accuse them of ill motivation. If adults balk at hugging kids, explain that a child that knows he is loved is more likely to be an emotionally healthy child or teenager, more likely to make responsible decisions, and more likely to become a responsible, loving adult.

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You can set an example by volunteering to teach Sunday School or work with the youth group. Some people think it's best if they do not work directly with their own kids. That's fine. By working with any group of kids you will be putting your money where your mouth is.