A lot of people seem to forget that our culture in Western countries is Christian, and that it has been so for two thousand years.
Starting with the Reformation wars and crimes, the French and Russian Revolution and today's proliferation of fanatic cults, it seems clear that what all these events have in common is their contempt for this original Christian heritage.
Secret societies have been the most murderous and disgusting force in human history so far, and for some reason they all share this hatred against Christianity unless when they use it to control other people's private lives with it.
Those who are not particularly rational, emotional or spiritual don't like to be at the bottom of the piramyd where they belong, so they build another one where they can be at the top without being particularly smart, humane or spiritually developed. Hence the secrecy.
You can be moral without religion, sure, but our religion is our tradition, it explains our culture and it forms our values. Without it, you reject thousands of years of accumulated wisdom, won't understand your own culture and heritage and will have whatever values suit you or somebody else manufactures for you.