score:10
Because, and I say this with all humility, everyone of us concedes (or at least should concede), we could be wrong.
Besides- one thing we know about God's Truth is that it can always stand up to rigorous inquiry. If it did not, either we serve a weak God (which we don't) or our understanding of God is wrong.
Either way, the last thing any Christian should be scared of is the Truth.
Upvote:2
When I was a Evangelical/Presbyterian(ish), I always took it as an opportunity to contrast beliefs: these people believe this, which is why we say that "such-and-so" and not "this-and-other." Comparing theology of communion and predestination was especially beneficial as that was an issue which was of particular interest to the people in my congregation.
And even though I have a different perspective (Catholic), that is still true: we can learn a lot from the teachings as to what is wrong with the gnostics. Augustine's refutation of Donatism and Manicheism are made more invaluable when you actually have opportunity to learn a little bit about the heresies.
Upvote:5
Several reasons: