Agnosticism is not defined by the fact that God cannot be disproved. Were that to be the case there would be no atheists. Even Dawkins accepts that there cannot be certainty about the non-existence of God.

As for who does more good in the world, this one never fails to amuse me. It's like saying that this great country of ours was founded "on Christian principles," as if that somehow confers an extra layer of goodness. There are huge numbers people on this planet whose lives are not based on Christian principles but who are just as saintly as the most saintly Christian. Christianity has usurped (as with Christmas) that which is good about people and pretends that somehow these values are its own invention. Well, the good news is that the world would manage quite well without Christianity but the "Christian values" would live happily on, just as they did before Christianity was so much as a twinkle in Joseph's eye. It's worth remembering that a world full of Christian values has just delivered the most brutal, inhuman century the planet has ever experienced, and I don't recall Christianity exactly standing by whilst it happened.