I consider myself a social conservative and think you are wrong on several fronts:
1. In regard to religion, the separation crowd has no real intention of abiding by the ramifications of such a doctrine. The "limited government" is neveral realized and in fact libertarians like this author seem acutely annoyed at religiosity. consequently, the mere presence of one tax dollar in a public event entitles them to grand enforcement of "freedom from religion" a right found nowhere in the constitution. The First of the first amendment freedoms provides a protection of religious establishments from the federal government. Libertarians and liberals have cooperated to turn this promise on its head and drive the "bulldozer" [scalia] of the wall separating church and state over their religious brethren.
2. Alcohol is a legal drug. It accounts for 40 percent of all traffic accidents and is involved in 40 percent of all violent crimes. The prohibition of alcohol to 18-21 year olds has demonstrably reduced traffic deaths by more than 2,000 a year.
3. As with drugs, libertarians always think that making things illegal makes them more attractive. Drug use is actually declining among youth despite the amusing anecdotes provided.
thanks for your comments. In regard to your first point, I think much of the debate over the public display of religion etc.. is due to the public ownership of the area in question. For example, prayer in school would be a moot issue if schools were private.
On your last two points, With the first, I don't think the figures you say have been demonstrated are true, and don't see how it can even be known. It would be equally easy to raise the limit to say, 25, and save a few thousand more lives right? With the second, I believe it is the case that European countries with freer drug and alchol laws have lower per captia use of those substances.