I'll answer as concisely (and honestly) as I can; hoping the reader will appreciate that in matters of belief or unbelief, there are myriad influences both good and bad.
As a child the most influential person in my life was my mother (no surprises there); as young as I can remember she was a woman of deep faith, having, what seemed, such hope and peace and wisdom. Contrastingly my father was an unbeliever, and not a happy man, apparently angry at my mother for her faith. Of course, I made the assumption that religion brings joy.
Time went on and life matured my thinking regarding the complexity of people and truth, such that in my later teens I began to question my prior concepts of God and faith. I turned to the literature of apologists and theologians, finding again more solid footing.
Whether by providence or mere chance I was raised in the Christian faith, therefore the Bible dramatically influenced my beliefs and centred my reasoning around its teachings, warnings and promises.
Surer in my faith, I adopted several male mentors within the church I attended, men who I admired for their wisdom and integrity. Some of those have since fallen in my esteem, but their impact in my life lives on.
My wife has been a powerful influence throughout my adult life. In her I see the fruit of living for Jesus; and I am truly humbled by it.
And lastly the secular world influences me, either reinforcing or challenging my faith and beliefs.