R. Jonah was a thirteenth-century scholar who lived in Spain. Although originally opposed to Maimonides’ philosophical works (most notably, his Guide for the Perplexed), he later changed his views, and even vowed to travel to Maimonides’ gravesite to posthumously beg for forgiveness. (He indeed began the long journey, but passed away before completing it.)
R. Jonah authored Shaarei Teshuvah (an ethical work on repentance), a commentary on R. Isaac Al-Fasi’s halachic compendium, and a commentary on Ethics of the Fathers, among other works.
Others date his passing as 1 or 28 MarCheshvan.
Link: Rabbeinu Jonah Gerondi
There are those who mistakenly categorize Jews as religious and non-religious.
According to our Torah, there is no Jew who is not religious. All Jews are believers from birth.
Superficial, external factors may bring them to go against their true selves. But their hearts are always awake and open to Torah and mitzvahs. They are only waiting for someone to press the right buttons.