3 For though we walk in the flesh, we are not waging war according to the flesh.
4 For the weapons of our warfare are not of the flesh but have divine power to destroy strongholds.
5 We destroy arguments and every lofty opinion raised against the knowledge of God, and take every thought captive to obey Christ,
6 being ready to punish every disobedience, when your obedience is complete.

Is this quote [ESV] from 2 Cor 10 true of modern believers?

We are often socially engaged and campaign on issues of rights and justice. Indeed, you will commonly find campaigners on both sides of modern controversies each of whom sees him/herself as obeying God with their efforts.

And there are so many parachurch organisations who want to stir us to action. Write to your MP about debt relief, religious persecution, homosexual “marriage” etc.. Send more money to our organisation which is doing God’s work but strangely never seems to be properly funded by Him.

They all assume the power and the glory belong to the governing institutions – Parliament, UN, EU, etc. or to the Media and (that strange monster) Public Opinion.

The weapons of our warfare are no longer the weapons of the cantakerous Jewish convert who wrote Second Corinthians. Neither are they mighty.