Will the saved people that are in heaven as spirits … ?
That's a big assumption for a general category of Christianity.
Some denominations do believe this doctrine, but many others fail to find any biblical support for it.
Nowhere does the Bible ever say that people will go to Heaven when they die.
The Bible talks about death as "sleep", and ...
The flesh is the mortal body that dies.
The celestial body is the alien body.
The heavenly body is the resurrected body that has physical immortality. The dead (flesh/she'll/mortal/corruptible) body (that is judged) either receives
Spiritual/heavenly/immortal/incorruptible body which is put back into the dead body from Holy Spirit and lifts up the body to ...
What is the point of the comparison of Jesus' visit (parousia, Second Coming) discussed in Matthew 24 and Noah's flood?
The first thing to note is that the emphasis at Matthew 24:36-44 is that the flood came at them unawares, not that it was a worldwide event.
"For as were the days of Noah, so will be the coming of the Son of
Man. 38 For as in those ...
For the time being, I have only considered the Didache, that "most scholars now assign ... to the first century".
Here is the last chapter on the Didache, in the Lightfoot translation:
1Be watchful for your life; 2let your lamps not
be quenched and your loins not ungirded, but be ye ready;
3for ye know not the hour in which our Lord cometh.
Are there any extra-biblical writings that documents what the early Christians believed about the second coming of Christ?
Of course there are!
The following have all written about it:
The Epistle of Barnabas (70 AD - 132 AD)
Tertullian (155 AD - 222AD)
Irenaeus (130 AD - 202 AD)
Lactantius (250AD - 325 AD)
Hippolytus (170 AD -230 AD)
The Shepherd ...