“Since we believe human testimony, surely we can believe the greater testimony that comes from God. And God has testified about his Son. All who believe in the Son of God know in their hearts that this testimony is true. Those who don’t believe this are actually calling God a liar because they don’t believe what God has testified about his Son.”
1 John 5:9-10 NLT
Those who reject the trinity are calling God a liar. We see this a lot in today’s culture, we see people reject God daily. People profess lies about him, but we should speak against these professions and teachings. We’re to be the light in this world, and spread the truth as God wants us to. We shall share Christ’s testimony to people. Don’t shy away from the truth believers and stand firm in the faith.