Q1. (Jude 3) Why must we "contend for the faith"? What is the danger in not challenging the doctrines of false teachers? What is the danger inherent in challenging them? How can we keep the correct balance?
This topic reminds me of the end of The Manhattan Declaration which states:
Because we honor justice and the common good, we will not comply with any edict that purports to compel our institutions to participate in abortions, embryo-destructive research, assisted suicide and euthanasia, or any other anti-life act; nor will we bend to any rule purporting to force us to bless immoral sexual partnerships, treat them as marriages or the equivalent, or refrain from proclaiming the truth, as we know it, about morality and immorality and marriage and the family. We will fully and ungrudgingly render to Caesar what is Caesar's. But under no circumstances will we render to Caesar what is God's.
The danger in not challenging false doctrine is that we become complicit in leading others astray.
The danger inherent in challenging false teachers is that we could become involved in unprofitable arguments.
To maintain the correct balance we have to learn to maintain an attitude of love.