Peter Van Inwagen and epistemology

A quote that I have posted by Peter Van Inwagen several posts ago deserves some explanation... here it is:

In current epistemology there is a denial that any type of certainty can be obtained with respect to knowledge. In other words, we cannot be sure about anything that we know, at best we can have a high probability. (This will be a simple non-technical explanation.) What Inwagen is saying is that epistemology realizes that certainty about knowing things cannot be obtained, yet people are quick to dismiss the claims of Christianity. Why should Christianity have to prove its doctrines with certainty, when no other epistemological claims can generate certainty? There is a double standard. Now Ang's concerns are well-founded. Often in the church, people will allow weak evidence to support Christian claims, while letting strong evidence for non-Christian claims be ignored - Ang's point is valid. Van Inwagen though is also critiquing the non-theistic crowd, don't apply a standard to us that you don't apply to yourselves. We cannot be certain of any of Christianity's claims, yet neither can secular philosophers be certain about atheistic claims, this is the bottom line.