Regarding leaven being poisonous, do you have a source for that?
What is the difference between leaven and yeast? Of what is leaven composed?
You indicated otherwise in post #537.But Jesus is describing the kingdom there, he is not describing God.
Don't you see, the parable is one of a couplet, and both symbolize the same characteristic of the kingdom of God--its growth (Lk 13:18-21).
The first symbolizes the external growth of the kingdom: though the kingdom will seem to have an insignificant beginning, like the huge tree produced by the small mustard seed, it will eventually spread throughout the world.**
The second symbolizes the internal growth of the kingdom: the powerful influence of God's kingdom (the Holy Spirit) permeates one's whole life from the inside, just as a small amount of yeast permeates the whole lump from the inside.
It is hidden, like the leaven, quietly making its influence felt, without force or violence, until one day it will come out into the open, to be seen by all.
This is particularly relevant to those who thought the Messiah would overthrow the secular government.
There are some manifest problems with your interpretation. The parable clearly links the kingdom to the leaven and to the mustard seed.
1) Your interpretation of leaven makes the parable link the kingdom to corruption and uncleannes.
2) In order to make your linkage fit, you have to do some wrestling with its clear language (God became corrupt). But it's not about God. . .and it's not that abstruse.
3) Your interpretation sheds no real light on the nature of the kingdom--its hidden, quiet, non-violent influence from within, correcting the false messianic hopes of the time.
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**Ps 104:16-17; Eze 17:22-23, 31-36; 1 Kgs 17:6