If I am not mistaken, many people wanted Lennon and the Beatles to become more politically-charged, but Lennon was still in his LSD-years and was more into eastern spiritualism than politics.
I guess that Lennon was very interested in social issues, and the very serious issues of hunger, war, and disease at that time, naturally that led to a political journey as he tried to search for cures.
That journey seems to have gone from the first impulse of throwing money at them, to later seeking deeper, root causes, and solutions.
He is very clear about not being an atheist and that he thought man from monkeys evolution was ridiculous, he also mocked overpopulation and knew that we could sustain many more people with more organization and distribution control, which of course, is a mixed bag of left and right.