Christians. Who do you believe in more?

That's not quite true. Certainly most Christians believe so, but there are some modern Christian sects who don't. They are collectively known as non-trinitarians.

The largest non-trinitarian Christian denominations are The Church of Jesus Christ of Latter-day Saints, Oneness Pentecostals, Jehovah's Witnesses, La Luz del Mundo and the Iglesia ni Cristo, though there are a number of other smaller groups, including Christadelphians, Christian Scientists, Dawn Bible Students, Living Church of God, Assemblies of Yahweh, Israelite Church of God in Jesus Christ, Members Church of God International, Unitarian Universalist Christians, The Way International, The Church of God International, and the United Church of God.