(Quote from https://realreality.org/downloads/how-god-will-transform-you/)

Christ reveals Himself to every person, even those who don’t seek Him. Some are in denial. They call themselves atheists or agnostics. However, they know. God has revealed Himself to them. And God has revealed everything that can be known about the Godhead. That means they know about the Father, Son, and Holy Spirit. (see Romans 1:19) No one has an excuse. (see Romans 1:20)