“Gods makes it clear in Genesis that the kinds reproduce after their own kind. (Genesis 1:21,24,25).”
The verses state they were created after their kind, not that they can’t reproduce with anything outside their kind. Besides, we have no clue what method might have been used to produce any potential hybrid offspring. For all we know, it may not have been physical reproduction at all.
“Angels do not marry and do not reproduce.”
Angels in heaven don’t marry, sure, but there is no statement as to whether or not they can reproduce, or to whether their not marrying is a strict limitation, or an act of obedience to some law. If it is simply an act of obedience, and the angels in question were fallen, then they may have chosen to disobey.
“”Sons of God” are men who believe on The Lord (see John 1:12). The “daughters of men” are the unsaved females of the unbelieving tribes/groups.”
So, do you believe that just breeding with unbeliever females produces giants? I would say the fact that the offspring are described in unnatural terms suggests an unnatural union produced them.
They were created after their kind and they procreate after their kind. That's what makes a kind a kind--procreation is constrained within the kind. Your wild speculation is unfounded.
Besides, we have no clue what method might have been used to produce any potential hybrid offspring. For all we know, it may not have been physical reproduction at all.
You've been indulging in too much science fiction.
Angels in heaven don't marry...
You suggest that angels who are cast out of heaven can break, as it were , their vow of chastity and start procreating. First, all angels and Satan are still in heaven. They have not been cast out heaven yet. That doesn't happen until Revelation 12:9 which coincides with the start of the persecution (tribulation) of the saints. Consequently, any theories involving post-heaven angelic beings procreating with men are non starters, because they are still in heaven. Second, after they are cast out, they will endure for only a short while until they are bound in hell or cast into the lake of fire (Revelation 19:20, Matthew 25:41).
The passage from Matthew 22:24-30 is specifically talking about "raising up seed" and states that angels do not raise up seed. Resurrected believers do not procreate because they will be like the angels of God when they (the resurrected believer) are in heaven. Fallen angels do not die like humans do and have an opportunity to be saved and resurrect. Fallen angels will spend eternity in the lake of fire which was made specifically for satan and his angels.(Matthew 25:41)
The Sons of God mated with the daughters of men and produced "mighty men of old, men of renown." It doesn't say they were giants. And if it had, it simply means they were very large men, not some new creature, for creation has ceased. God rested after day 6.