As opposed to the brainwashing that happens all of the rest of the time? As a pastor I despair of making enough of an impact in an hour or two to overcome all

As opposed to the brainwashing that happens all of the rest of the time? As a pastor I despair of making enough of an impact in an hour or two to overcome all the influence of school and work that people experience for many tens of hours each week and the average of twenty hours (or is it more now?) of TV that people watch. For the record, I prefer "Merry Christmas", except where someone is obviously trying to invoke a guilt purchase.