Huh? What multiple truths? I support biblical, historical, orthodox Christianity on the essentials. Peripheral issues like Calvinism vs Arminianism vs Open Theism are debatable and believers have freedom to formulate convictions based on Bible without compromising the essentials.
I affirm ONE God, not multiple gods like Mormons, Hindus, and JW with God and a god.
I do not own truth, but I can believe truth. God is either triune or solitary. He is not both. Jesus is either God or created being, not both. One statement is true and defensible, while the other is false. We can show why Islam is not truth. We can also show that Christianity is true, not Buddhism. Relativism blurs distinctions between truth and error, but revelation demands absolutes (whether we find them or not).