Theism, which means the existence of a transcendent being beyond the material world and accepting its sanctity, often defend the idea that God has an eternal, conscious, universe-knowing and strong personality. In this paper, I outline and discuss how theism is treated and assessed by English Philosopher Frederick Robert Tennant (1866-1957) and which differences and superiority it can provide against other philosophical movements. In addition, it will be emphasized how Tennant attempts to harmonize positive sciences with philosophy and theology.