Or as Dijkstra puts it: “asking whether a machine can think is as dumb as asking if a submarine can swim”.

Alan Turing puts it similarly, the question is nonsense. However, if you define "machine" and "thinking", and redefine the question to mean: is machine thinking differentiable from human thinking; you can answer affirmatively, theoretically (rough paraphrasing). Though the current evidence suggests otherwise (e.g. AI learning from other AI drifts toward nonsense).

For more, see: Computing Machinery and Intelligence, and Turing's original paper (which goes into the Imitation Game).