Imagine we have only the bible as our scriptural guide. No Opinions, traditions etc. Just a simple text document from gen to rev. It is a complete compilation of the knowledge God has given us. Within its contents is the truth but is must be looked for intently to be discovered, Ps 25:2.
Pr 25:2 It is the glory of God to conceal a thing; But the glory of kings is to search out a matter.
(ASV)
Then we add Jesus words along this line -
Mt 13:11 He answered and said unto them, Because it is given unto you to know the mysteries of the kingdom of heaven, but to them it is not given.
Here -- The Second Coming is when Jesus comes into the human heart.
Joh 14:23 Jesus answered and said unto him, If a man love me, he will keep my word: and my Father will love him, and we will come unto him, and make our abode with him.
This is unquestionably the second time Jesus comes to man. as is seen from within the pages of scripture.
There are two appearances of Jesus in Heb 9:28.
Heb 9:28 So Christ was once offered to bear the sins of many; and unto them that look for him shall he appear the second time without sin unto salvation.
Since this is the case every appearance of Jesus in the life of man after the cross when He bore sins must be one which falls under the heading of the second Coming or appearance. The stated purpose of the Second appearance is the salvation of man.
All of this chatter about opinions is in Christendom is like the religious people of Jesus days - they get off topic immediately and continue to diverge from the main concept as it is stated in the Holy Scriptures.