Actually if I recall both Buddhism and Hinduism have variable beliefs etc. depending on your location and what you want the faith to be. You can be a polytheist, atheist, monotheist, pantheist, and every other kind of religious position as a Buddhist or Hindu. This because Hinduism is incredibly old with many different cults that have widely different ideologies, and Buddhism was derived from that religion as well and borrows and adapts from the native philosophies and religions around it.
This is somewhat true, though I wouldn't describe Buddhism as "monotheistic" by any stretch.
Buddhism generally adapts to local religions. In Thailand, it adopted to the local Hinduism and animism, in Tibet, it adapted to Bon shamanism. In Japan, it adapted to Shinto, in fact many Japanese historically practiced both in what was called
Shinbutsu Shugo.
It is well known that Buddhists believe all of reality to be illusory (maya). You can interpret that how you like, but one implication is that they do not believe reality to have the same degree of substance that Christians affirm it has.
That's more like Vedanta, not Hinduism. The concept of
maya is not part of Buddhism.
@Hmmm! is correct to say that if the world were illusory, dropping a hammer on your toe wouldn't hurt. However, our common conceptualization of the world is often distorted by delusions of various sorts.
There's a great book by Steven T. Katz Mysticism and Philosophical Analysis, which analyzes the various reported experiences of religious mystics. The basic conclusion of the analysis of the phenomenology of the various experiences is that it is the same experience with different metaphysical underpinnings. It's a fascinating read.
There are similarities between Theravada Buddhist descriptions of the various
jnanas, Mahayana Buddhist mystical descriptions of the
Dharmakaya and Christian mystics' descriptions of God. However, Buddhism presents a much more thoroughgoing system for realizing this through ethical and ascetic cultivation.
A research study several years ago looked at Carmelite nuns hooked up to an EEG machine and asked them to reflect on an experience of union with God. All of them had elevated levels of gamma waves in response. Expert meditators, on the other hand, who have practiced for decades, have continuously elevated levels of gamma waves in their brains, and are capable of greatly increasing the volume of gamma brainwaves at will when needed.
Here's a link to an article discussing the research study involving the nuns:
This Is Your Brain on God
Now, as a whole hearted Christian, I hold that any experience of enlightenment is mediated and realized in Christ, wittingly or unwittingly. Of course, I'm a healthy fallibilist, as well.
Christianity, in my experience, errs too much into rationalism, on one hand, or gross superstition, on the other hand. The ethical core is also frequently shallow and weak. It also can foster an erroneous view of the self.