I don't think the churches can be blamed for not having the staff or time to do individual look-ups. Those old record books are extremely difficult to read, dates and pages out of order, missing etc. In many churches, if there is a secretary at all, she works a few hours one afternoon a week. And if they let individuals search, the books would soon be in shreds, as they almost are already.
As important as it is to us, genealogy is not the mission of churches. The needs of the living, spiritual and physical, are their mission. The answer is to get these books digitized and online.