this is my view..
i dont think rationalism and Atheism are same thing. i do believe in GOD. but i dont believe in any religious customs and rituals.
i just believe there is supernatural power which is the root cause and control the entire universe and i dont believe i can change it and deal with that power using any wasteful mantras or Poojas or something stupid like that.
Rationalism is just life style to prove urself that u r a human
A human with commonsense
A human with brain
A human who can think and analyze
Like Vivekanada said,
” I need you to be a rationalist than being a blind religious bcoz a rationalist has atleast brain, but the other one doesn’t have it”.