You could say the absolute, which they call voidness in Buddhism; it sounds a little scarier than "God," but I have always argued that it actually has a similar meaning, especially in the Hebrew tradition.
So, the teaching of voidness does not really mean that everything is nothing but that everything is empty of being whatever one thin it is.
Buddhadasa Bhikkhu: Life and Society through the Natural Eyes of Voidness
Broughton twists the English to match the Chinese, rendering the passage: "As medicine to counteract existence, [the Mahayana] speak the medicine of voidness
By arresting both breath and mind through controlled respiration, the objects of the senses are restrained and a continued voidness
of conception ensues, leading ultimately to the fourth superconscious condition (turya, turiya) in which one's soul (atman) is free to dwell with the universal spirit (brahman).