Yes you could still be an atheist and believe in a soul.
You would not be a critical thinker, but you could still be an atheist.
Atheism is a position on a single claim, the existence of a god or gods. Anything beyond that one position is outside the purview of atheism.
Not all atheists are critical thinkers. I know atheists that believe in: alien visitations, ancient aliens, homeopathy, all sorts of conspiracy theories, etc.
You would not be a critical thinker, but you could still be an atheist.
Atheism is a position on a single claim, the existence of a god or gods. Anything beyond that one position is outside the purview of atheism.
Not all atheists are critical thinkers. I know atheists that believe in: alien visitations, ancient aliens, homeopathy, all sorts of conspiracy theories, etc.
You'd believe if you just opened your heart" is a terrible argument for religion. It's basically saying, "If you bias yourself enough, you can convince yourself that this is true." If religion were true, people wouldn't need faith to believe it -- it would be supported by good evidence.