The most important reason anyone is an atheist

[Angrboda]

Intuitions can serve as a useful guide you in your acquisition of knowledge ... That said, take a look at physical reduction. I call it strongly counter-intuitive because it goes against the way we commonly think and feel every day. Its determinism goes against you feeling and acting as-if you have the liberty to choose between alternatives. ... That does not mean physical reduction is false. All I am saying is that materialism comes at a very high price because it undermines our humanity.

You jump from 'intuition is a useful guide' to claiming that ignoring it comes at a high price. This simply does not follow. Moreover it's an example of begging the question as it's harmfulness largely depends on it being false. Or are you arguing that some falsehoods are too useful to give up? I don't find my 'humanity', whatever that means, to consist of believing falsehoods. It is only because you have assumed your conclusion that you consider it so.

As a point of fact, I do not know anyone that actually lives their life as if they were an undirected and meaningless physical process.

And this is a whole other kettle of fish unrelated to the rest. In the first place, this doesn't follow from the assumptions of materialism. It does follow from your beliefs, however, which likely makes it another example of question begging. Regardless, this is one of your favorite arguments from ignorance, that you can't see how X is possible under materialism, therefore it is not. In the past you've used 'justification of inductive inference' in place of X, whereas here you're using 'meaning' in its place. These are your problems, not those of materialism. (And note also that this is an argument from consequences; a life without meaning being undesirable or hard to 'live' doesn't make it any less likely. I can't imagine something that is both a wave and a particle. That's not quantum theory's problem.)