gandhiji was 'jain' by religion.the principles of jainism are non violence and non aggression against any being of the planet ..even to microbes and harmful diseases.
check wikipedia for more on jainism.
these principles were put into action by gandhiji and were renamed as satyagraha ..meaning protest without violence ..expecting the tormentor to stop because his own conscience will stop him from doing anymore harm.
What makes you think he did? I am searching the biography of Gandhi on Wikipedia, which is quite thorough, for the word "religion", and it doesn't mention anything about him changing his religion.
Hinduism
he was a hindu.
Hinduismhindu
He is a saint of every religion to some.
Hindu Brahmin
Gandhi
He opposed Gandhi's program of tolerance for all creeds and religion
he was a jainGhandi was a Hindu.Hinduism
Jis g3106, sm490ya jis g3106, sm570 g3136
Gandhi used peaceful potesting
Gandhi helped Indian people to get its independence