Buddhadasa

Buddhadasa's, a famous Thai monk lived from 1908-1993.

Wikipedia: “Buddhadasa renounced civilian life in 1926. Typical of young monks during the time, he traveled to the capital, Bangkok, for doctrinal training but found the wats there dirty, crowded, and, most troubling to him, the sangha corrupt, "preoccupied with prestige, position, and comfort with little interest in the highest ideals of Buddhism. Buddhadasa rejected the traditional rebirth and karma doctrine, since he thought it to be incompatible with sunyata, and not conducive to the extinction of dukkha.”

Buddhadasa: "Take the question of whether or not there. is rebirth. What is reborn? How is it reborn? What is its kammic inheritance? These questions are not aimed at the extinction of Dukkha. That being so they are not Buddhist teaching and they are not connected with it. They do not lie in the sphere of Buddhism. Also, the one who asks about such matters has no choice but to indis­criminately believe the answer he's given, because the one who answers is not going to be able to produce any proofs, he's just going to speak according to his memory and feeling. The listener can't see for himself and so has to blindly believe "the other's words. Little by little the matter strays from Dhamma until it's something else altogether, unconnected with the extinction of Dukkha." (Heart Wood From The Bo Tree)