Plantinga's beef with evidentialism

If the Holy Spirit overcomes the blinding power of sin, surely we can be persuaded to believe on the basis of evidence, like Josh McDowell or Richard Swinburne offers? Big Al says:

I don't think so. Even discounting the effects of sin on our apprehension of the historical case, that case isn't strong enough to produce warranted belief that the main lines of Christian teaching are true - at most, it could produce the warranted belief that the main lines of Christian teaching aren't particularly improbable.
Warranted Christian Belief (p. 271)