Can we as human beings truly understand what Allah/God is in pure form?
Or can we only gain understanding of what Allah/God might be in his purest form?
Can we say: this is Allah/God?
Yes and no.
Yes...we can do so say in poetry and art...many expressions of god (and the like) one can't put in words can be expressed by visual language.
We can by expressing our experiences and finding a single motivator(s) of them. For example, some christians call the experience of wholeness love. To me, that experience is freedom and gratitude. To another...
No, because each person's experiences are unique. Freedom to me isn't someone who loves me, someone I worship, or someone I serve-not a god. While others, it may be the act of surrender, the pull to serve, and the experience of profound gratitude.
Most of the time talking with religious on RF all of them-every single one-says their experiences are personal.
God probably can but it takes strength and humility to let down our defenses on what's personal to others.
Something I read once. An author asked her native american friend if she can use his words in her book.
Her spiritual advisor said, "of course. Nothing I say is mine but owned by god."
https://www.amazon.com/Wisdom-Native-Americans-Kent-Nerburn/dp/1577310799
https://www.amazon.com/Native-Wisdom-White-Minds-Reflections/dp/0345394054
I can't remember which it was, but they are good sources of wisdom of you're interested.
It's very important to understand the difference between religion and faith. Because faith is not about having the right answers. Faith is a feeling. Faith is a hunch, really. It's a hunch that there is something bigger connecting it all... connecting us all together. And that feeling, that hunch, is God. And coming here tonight, on your Sunday evening... to connect with that feeling, that is an act of faith." Father Brian (Keeping the Faith movie)