The person making the false threats to the church might be simply attempting to instigate attention or trying to discredit another person. That's typical in suburbia-ville where everyone knows everyone. However, you never want to validate, escalate, and amplify that person's claims as soon as they are determined to be invalid. It's ok to love them & at the same time, it is healthy to not allow them a position of representing the church in a greeter, coordinator, or the point-of-contact for anything 'church related'. Until and unless the original situation is resolved with acknowledgement, understanding, and a commitment to not make any further false claims, then it is ok if the person maintains a healthy yet loving separation for a while.