Firs of all, what exactly is "so much injustice"?
Where does it cross the line into being "too much" instead of just normal variations in a system? Do you have an objective yardstick for that, or is this, as I suspect, just presumption? It's a meaningless statement out of context.
Second, the ACLU is a private organization made up of a lot of state and local chapters, and they all have their own ideas and priorties. It's also not for you to set their agenda for them.
The First Amendment is, arguably, the most important within the Bill of Rights and therefore deserves the most attention and respect.
Your link of crime rate to declining prayer is a classic post hoc fallacy, by the way. There is no link, at least not to that.
The rest of your post is so full of overblown assumptions and logical fallacies that it is hardly worth further comment.
If you want to change society, you are barking up the wrong tree.