Ok.Letme have a bash.
1 'Christians are stupid'. I have to say I don't hear them say this but Christians have complained that they do.I Think that what they mean is that the atheist debunks of theor best apologetics make them sound stupid. The Christians need better apologetics.
2 "Miracles don't happen". This is not actually dumb, but sounds it. It is probably not denying that miracles may be possible no more than saying 'There is no God' means a total denial of any such possibility. It is saying that the burden of proof falls on the claim of a miracle to prodice the evidence. Which brings me to the next one
3 The Bible is not evidence. True, one cannot quote the Bible to prove the Bible...but again, it may contain internal evidence that supports it, but only because outside evidence supports that.
4 "Nazareth never existed". This is not really dumb, but sounds too much like a known thing like Tyre definitely was not forever destroyed.The limited archeology sugests that there was not even a decent -sized town in the 1st c AD, but more work and study is needed before we can deny Nazreth with real confidence.
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I'm struggling.

The Jibes 'atheists denied the Hittities', "Christians are afraid of Hell", ..I got nothin' more...are back engineered arguments that are wished on atheists. A search of the Hittite claim led to nothing but some atheist professor debating the status of a Neo - Hittite prince. True the Bible does mention the Hittites but they were just thought to be a Canaanite tribe as they were, after the bronze age collapse. Nobody knew of the Hittite Empire which led SOME few Christians to accuse atheists of denying the Hittites existed. The afraid of Hell thing came about from looking at the text for Dream of Gerontius, a wretched poem set to glorious music by Elgar. The spirit of the believer zooms through an asteroid belt of demons on the way to God's blasting presence (Elgar had the entire orchestra play one chord together as loud as possible) and the Demons chant about people who believe though fear., not through love. That was a craftiness worthy of CS Lewis. Since it is a Real Question whether it really is love or fear. But instead of addressing it, Newman puts the point into the mouths of the demons and disposes of the problem by - literally - demonizing it. So some of these atheist jibes are more doubts that occur to Christians and so by having atheists say them (often in a strawman version) they can ignore them.