Lutherans gave me a love for the Bible. Pentecostals, a love for the Spirit. Reformed, a theology of the atonement. Congregationalists, a view of church government. Baptists, a method of baptism. Methodists, lessons on prayer. Catholics, GK Chesterton.
In a free society, it's often much easier to criticise external structures, movements, churches, politicians, etc, than it is to identify and repent of our own sin.