Then again, do you know many Christians who explicitly signal their beliefs like that? I think they're much more likely to say "Jesus is the son of God" than "I believe Jesus is the son of God".
It's rather uncommon for any follower of faith to preface their beliefs with "I believe". If they preface them at all, they're much more likely to use "I know", or "$authority says".
>99% of atheists would choose the latter as better representing their personal stance on the matter. Further, almost all would additionally agree that if there were evidence for God's existence, they would believe.
The concept of "faith" is not one that resonates with atheists. Christians however, love to pretend that disbelieving requires just as much magical thinking as believing, and this is a classic example.
It's rather uncommon for any follower of faith to preface their beliefs with "I believe". If they preface them at all, they're much more likely to use "I know", or "$authority says".