Why did Henri Bergson come close to Catholicism without converting?

The French philosopher Henri Bergson felt a deep intellectual and spiritual affinity for Catholicism, which he viewed as the fulfillment of Judaism. In his 1937 will, he explicitly acknowledged his moral adherence to the faith.1

However, Bergson chose not to convert because he foresaw the rise of a severe wave of anti-Semitism. He felt a profound moral obligation to stand in solidarity with those who were destined to be persecuted. Consequently, he refused an exemption offered to him by the Vichy government and, shortly before his death, formally registered as a Jew to ensure he remained among the persecuted.1