That's the whole point, isn't it? Is there something? Is there nothing? Or is there no thing? The ineffable and at the deepest core that's what we are. All of us. All of creation.

I'm not versed in Buddhism, but I think I'm beginning to understand why the Buddha refused to addressed this. He remained silent because it's beyond thought and word.

Practice born out of theory leads to realization. Theory leads to intellectual understanding and practice leads to experiential realization. All spiritual paths have both and all paths have the potential for actual experiential realization. Self-realization. God-realization.

If I had to I'd say all paths have one thing in common, and that's letting go of what we think we are and realizing we are the ineffable. That's the difficult part and theory only gets one so far. That's why I advocate engaging in the practices of a chosen path.