Aquinas. His writing is a bit much to approach directly. But if you're looking for an intellectual approach, IRL I recommend to people Edward Fesser's "The Last Superstition" or "Aquinas". The first a broad response to the "New Atheists" covering a wider intellectual tradition, and the latter more focused on Aquinas himself. To warn you, I have been (accurately) accused of popery, so if that bothers you: CS Lewis.
Aquinas. His writing is a bit much to approach directly. But if you're looking for an intellectual approach, IRL I recommend to people Edward Fesser's "The Last Superstition" or "Aquinas". The first a broad response to the "New Atheists" covering a wider intellectual tradition, and the latter more focused on Aquinas himself. To warn you, I have been (accurately) accused of popery, so if that bothers you: CS Lewis.
Edit: I recommend Lewis either way really. This channel is fun: https://www.youtube.com/channel/UCw-kYN6wWXWDyp_lB0wnlxw