The ultimate ground of all being in Hindu is "Brahman". It's basically just Allah. Of course syncretism would be possible. It only gets sticky on the lesser gods. It only gets sticky on the idolatry... Which was my whole point. If Islam thought the idols were an irrelevance, then maybe it could slip into the culture's belief structure and inform the Hindus about the true nature of Allah.
Again I'm coming from the perspective of learning about Buddhism, which is often so subversive that I admire that quality of it as a delivery method for helping people find the truth (and I assume that such a character of religion could be used to deliver non-Buddhist truths, such as monotheism). It so ignores concerns of "form" that right now you have Christians, scientism-based atheists and even Muslims who think that it is "compatable" with their existing beliefs. In some ways I think it is not compatable with these exististing belief structures, but it gets its foot in the door in a startlingly effective way.
It's ok if you find that uninteresting, or a position that is compromising to religion, but I find it interesting how this religion has penetrated white Christian + secular America, to a degree that Islam simply won't. Thought there might be something to learn, there. My 2 cents.
I stand by it. A million beliefs get absorbed into Hindu culture. Islam says "no, we have the complete truth and yes it is different than yours". It therefore forged a separation of religious culture on the Indian subcontinent... And in a land of a million existing beliefs, that is remarkable.
I'm not talking about Islam being combatitive or anything.. But I am saying it is "Non-water soluble". It doesn't mix. That may keep it pure, but it keeps it out of many cultures.