Why does anything exist ... why not nothing?

He is the image of the invisible God , the firstborn of all creation: for by Him all things were created, both in the heavens and on earth, visible and invisible, whether thrones, or dominions, or rulers, or authorities—all things have been created through Him and for Him. He is before all things, and in Him all things hold together. He is also the head of the body, the church; and He is the beginning, the firstborn from the dead, so that He Himself will come to have first place in everything. For it was the Father’s good pleasure for all the fullness to dwell in Him. - Colossians 1:15

Philosophia


The word philosophy comes from the Ancient Greek words φίλος (philos) ‘love’ and σοφία (sophia) ‘wisdom’. Some sources say that the term was coined by the pre-Socratic philosopher Pythagoras, but this is not certain. The French philosophie is itself a borrowing from the Latin philosophia.
Philosophy is a systematic study of general and fundamental questions concerning topics like existence, reason, knowledge and mind.
Western philosophy originated in Ancient Greece and covers a wide area of philosophical subfields. A central topic in Arabic–Persian philosophy is the relation between reason and revelation. Indian philosophy combines the spiritual problem of how to reach enlightenment with the exploration of the nature of reality and the ways of arriving at knowledge. Chinese philosophy focuses principally on practical issues about right social conduct and self-cultivation.
Major branches of philosophy are epistemology, ethics, logic, and metaphysics. Epistemology studies what knowledge is and how to acquire it. Ethics investigates moral principles and what constitutes right conduct. Logic is the study of correct reasoning and explores how good arguments can be distinguished from bad ones. Metaphysics examines the most general features of reality, existence, objects, and properties. – wiki paraphrased