You used the phrase “Second Adam” when referring to Christ in your Heaven book. No where in the Bible does the term “Second Adam” appear. The Scriptures refer to Christ as the “Last Adam” rather than the “Second Adam” (1 Corinthians 15:45.) If there is a Second Adam, people may deduce that there is a third Adam, etc,. Not so. Jesus Christ is the final, corporate head of a new human race born of God.
In the immediate context of this passage, Adam is called the “first man” and Christ is called the “second man.” I said “second Adam” because there was a first Adam, and Jesus is the second. However, I agree it would be better to say “Last Adam” and I will be making this change in a future edition to eliminate any confusion.
For more information on this subject, see Randy Alcorn's book Heaven.