Enlightenment is not the acceptance of, or practical experience of rebirth. Enlightenment is not the acceptance of, or practical experience of a ‘soul’ theory. In other words, a fully enlightened and rational mind, is a mind ‘emptied’ of all delusion and irrationality.
The Buddha explained that physical existence is ‘nama-rupa’, or ‘mind-body’. This analysis is found in the received Chain of Dependent Origination (specifically in the 4th link which is conditioned by consciousness [mind], and which in turn conditions the sixfold sense-base [body]).
The Buddha advises that all those who follow his path must ‘uproot’ ALL ignorance. This instruction alone proves that the Buddha was a ‘scientist’ and not a religious teacher in the conventional sense.
The Buddha rejected ‘idealism’ as being an expression of deluded thought, but the Theosophist Movement essentially interpreted Asian spiritual culture through a Judeo-Christian filter, and this was compounded by the work of DT Suzuki, who mistakenly presented in English translation, the Lankavatara Sutra as being an idealists charter, rather than the sophisticated analysis of the human mind existing and interacting in the physical world that it undoubtedly is.