Don't be tossed to and fro with every doctrine or idea of men.
(Mat 10:24) The disciple is not above his master, nor the servant above his lord.
(Mat 10:25) It is enough for the disciple that he be as his master, and the servant as his lord. If they have called the master of the house Beelzebub, how much more shall they call them of his household?
(Mat 10:26) Fear them not therefore: for there is nothing covered, that shall not be revealed; and hid, that shall not be known.
(Mat 10:27) What I tell you in darkness, that speak ye in light: and what ye hear in the ear, that preach ye upon the housetops.
(Mat 10:28 ) And fear not them which
kill the body, but are not able to kill the soul: but rather fear him which is able to destroy both
soul and body in
hell.
(Mat 10:29) Are not two sparrows sold for a farthing? and one of them shall not fall on the ground without your Father.
(Mat 10:30) But the very hairs of your head are all numbered.
Hell in Matt 10:28 is gehenna as you've pointed out.
But contextually it would seem not to make any sense to say they are lost.
Do not fear those that can kill the body, but fear him who can lose your soul and body in Gehenna?
And if Hades is cast into the Gehenna and that is called the second death It would appear that your justification of this is trying to force your view into a box that does not fit it.
Whether you take Gehenna and Hades to be literal at this point, would not seem to matter, as their is a destruction that is called or likened unto death at this point...
Contextually he doesn't agree with the inspired Word of God. If I fear a MAN who can kill only my BODY, HOW MUCH MORE should I fear our Father who can kill my body BUT ALSO will kill my SOUL TOO?
Dead people are dead. So, once dead, that is the end deal. No more repentance, faith, love, mercy, etc.
The person you are debating with clearly twists words and scriptures beyond compare.
And if Hades is cast into the Gehenna and that is called the second death
Since when is "Gehenna" the "Lake of Fire"?
(Mat 10:28) And fear not them which kill the body, but are not able to kill the soul: but rather fear him which is able to destroy both soul and body in
hell(1067)(Rev 20:14) And death and hell were cast into the
lake(3041) of fire(4442).
This is the second death.
The "Lake of Fire" IS the second death, NOT GEHENNA or GEHENNA FIRE.
So, I will stop there. Spiritual death is MUCH more important that physical death.