He won't call himself an atheist because it's, in principle, impossible to prove a negative, but "agnostic" on its own might suggest that God's existence was therefore on equal terms of likelihood as his non-existence.
Han vil ikke kalde sig selv ateist, fordi det i princippet er umuligt at føre negativ bevisførelse, men agnostiker alene kunne antyde, at Guds eksistens derfor var på lige fod med sandsynligheden for hans ikke-eksistens.