Having been born into a highly secular society and raised in an irreligious and agnostic family background, I have been an atheistic materialist and naturalist for most of my life until my late thirties, and was only interested in nature and natural sciences. Due to my popular science interest in modern physics (cosmology, relativity theory, and quantum mechanics) I came to realize fundamental philosophical problems concerning time, causality, and the effectiveness of mathematics, as well as the hard problem of consciousness, the problem to explain intentionality and reason, as well as objective morality. This led to a spiritual journey over about 15 years in search for a coherent world view involving temporary commitments to very different views like mathematical monism (Max Tegmark), pantheistic neopaganism, non-dualism (Advaita Vedanta) and neoperennial integral thought (Ken Wilber), Whiteheadian panentheistic process thought, Nietzschean flux, quantum mysticism with monistic idealism (Amit Goswami), Neoplatonism with objective idealism (John Leslie), deism, and finally a generic philosophical / classical theism, but still consider weak panentheism with Neoplatonist monistic idealism as compatible metaphysics. I also thoroughly evaluated the pro and con arguments for Christianity, esp. Roman Catholic and Reformed theology, as well as Biblical exegesis and history. My "conversion" from atheism, materialism and naturalism to theism, immaterialism and supernaturalism did not involve any faith in scripture, but was based on reason and a careful and critical evaluation of empirical evidence as well as philosophical arguments.