At any rate, I'd basically translate the quote something like this:
That said, I think there's some element of hyperbole in the sentiment. I'm not sure I've met anyone for whom theism is the sole source of life's meaningfulness. For the devout it is an important fixture to be certain, the absence of which would leave quite the void. In that context, a little hyperbole is perhaps warranted. It is akin to the deep romantic who sings that their lives would be empty without their significant other. It tells us that person has a strong bond and relationship to something.
God is very important to me and helps establish my purpose in life. Without God, my life would feel purposeless. Without purpose, my life would feel meaningless, insignificant, and hopeless.
I don't take issue with the general sentiment. There's no point to being a theist if your theism isn't going to establish or inform life's meaningfulness to you. So much so that I don't think I'd call someone whose theism is completely disconnected from meaningfulness a theist at all.
That said, I think there's some element of hyperbole in the sentiment. I'm not sure I've met anyone for whom theism is the sole source of life's meaningfulness. For the devout it is an important fixture to be certain, the absence of which would leave quite the void. In that context, a little hyperbole is perhaps warranted. It is akin to the deep romantic who sings that their lives would be empty without their significant other. It tells us that person has a strong bond and relationship to something.