John's reference to "antichrists", meant that they were evident in the church in his lifetime. It is not a 20th or 21st century arrival.
A Christ like walk is attained, based on the maturity level of the believer.
After His resurrection, Jesus met two discouraged and forlorn men on the road to from Jerusalem to Emmaus . In their minds, a great teacher and rabbi had been killed and lost. And like sheep that are lost without their shepherd, they needed to be tended. Jesus took the opportunity to teach them that Christ could be found in all the scriptures.
My very first Bible was called a "Red Letter Edition Bible." With help from my dad he explained the significance of those letters printed in red ink.
For the follower of Jehovah, or of Jesus Christ, the theological message of the first chapter of Genesis declares that there is a God and God is responsible for all creation.