Even other (mainline) Protestants take the same approach, Cronos, which is of course the Christian approach.Exactly -- Lutherans like those in the LCMS will reach out to bring people to Christ. They (and Anglicans and Methodists etc) will rejoice when anyone learns more about Christ.
These fringe groups, the various freak cults you mention (Unitarians, English-Israelism, OPC, etc.) who are louder than their miserable numbers, are the ones who get their satisfaction by burning someone (an agnostic, atheist, Arminian, Catholic, doesn't matter) for breakfast, lunch, and dinner on a daily basis. To them a debating forum is a sacrificial altar.
Unless they label someone satanic, threaten them with hell, draw blood or flame anyone who disagrees with them their day isn't done. Nietzsche called people, who preach Christianity and love, but hate the whole world, the people or sessentement. How fitting.
If you ever get around to defending your faith with Scripture as Christians are called to do, be sure to let us know.