The harvest is plentiful but the workers are few.
(don’t waste your time trying to harvest tares)
But how many "anti-christian" people are that way precisely because the Church does not [personally] do? (i.e. "Church-people are hypocrites" mentality.) And how many would be touched to have genuine love showed to them?
In short, it is not our place to judge 'tares' from 'wheat', because in doing so we elevate ourselves to Judge of Men's Souls & Hearts. (Though there is the stipulation of dusting off your feet, even that is not a refusal to spread the gospel.)