They may never have sensed God but why do they not want God? Did you read the Nagel citation?
They haven't sensed any gods, not just yours - as to why they don't want God, that probably is, specifically, your god. That's because it's depicted as misogynist, homophobic, jealous, genocidal, aggressive, abusive drama queen. It's predicated on an abusive relationship - I can't guarantee to speak for Krauss or Nagel, but I suspect that whilst they don't believe in any gods, when they say they don't want a god the god they don't want is the one advocated by the vocally hateful in their community.
Krauss doesn't want God because he objects to God judging him.
I'd object if I thought that god was going to get to judge me, too - but one of the reasons I'm an atheist is because that depiction of god is so nonsensical as to be not worthy of being considered a god.
Why is Krauss a self announced antitheist?
You'd have to ask him, but amongst the possibilities: religion is problematic; religious people are problematic; Christianity, particularly the vocal, aggressive, nationalist American version, are problematic to him.
Why isn't he an atheist who doesn't believe AND wants God.
Because that god is a psychopath. Because that god accepts slavery, but decries homosexuality. Because that god decries murder, but kills off the entirety of humanity. Because that god's entire nature is predicated on the notion of vicarious guilt and blood sacrifice.
He doesn't want God because a God is oppressing him.
He doesn't want that god because anyone that does want that god has issues.
He feels God is judging him perhaps
He feels that god doesn't deserve to sit in judgement on anyone.
But that's not to say you cannot be an atheist and still emotionally want God.
It's possible. It's also possible to think that you want god, when what you really want is the feeling of belonging to a community like a religious congregation.
And then of course there is what is happening in your subconscious. And on that topic many an atheist here has stated that your consciousness follows the subconscious and that explains how people come to realise that they had, after all, been evading God.
That still doesn't work. Even if you want a god, if you don't believe in it you aren't going to try to evade it.
O.