Tradition, as in the edicts and creation of men, is exactly what killed Jesus Christ. He stood as a direct threat to the control and manmande traditions of men. Believe me, I am not comparing myself to Christ, but it's amazing how defensive people who hold to the traditions of men become when something "new" (although it's really not) threatens their position or their status quo.
I've heard the Constantine explanation over and over again, as to the church going 'off the rails' and it doesn't really expain anything.
I for one believe God used Constantine.
I believe Constantine was a well-meaning individual who sought to force Christianity upon the citizens of his rule. Constantine's efforts on behalf of Christianity made it fashionable and easy to become a Christian, although biblical discipleship requires much more than most of us are willing to give today (and I'm not talking about money!).
Christianity is completely relational and best thrives when open dialogue and visible respect of each other is expressed. However, as we all know, relationships are many times ugly in the making but beautiful in its more mature stages. Relationships are better fostered and strengthened when trials and tribulations are endured, which is why Christianity flourished in the first 300 years of its existence.
Persecution spread Christianity around the known world. Instistutionalization, brought on by Constantine, stopped the spread of the gospel and led to the power struggles of those who deemed themselves in "control" of the flock.
The church hasn't grown since Constantine?
Check history
In the fourth century, one had to study for up to three years as a catechumen before being baptized. I don't think that qualifies as "easy".
Do you really believe that Christians in "institutional" churches don't practice serious discipleship? Visit an Orthodox church next year during Great Lent a few times. Or, for that matter, try during Advent.
I would also say that people are looking for the Church, not something that calls itself something else. I think there is a hunger for something other-worldly. But instead of providing this, ministries and churches decide to make themselves look like the world, as if to say 'see, we are like you, our music is just like yours, our manners, our message is just what you like - your way, right away". This is not church, call it what you will, but it's not church.
There is a book out called "The New Faithful", written by a Catholic. There are many young people looking for the ancient traditions found in the Catholic Church. In the Mass, we are reminded of Christ's Sacrifice, our sins, His Body and Blood, His suffering, and our redemption. Isn't that what it's all about? What can you add to this?