[fidelis]

In the examples you give, birds can be seen as demons making a home in the Kingdom. And a woman places three meals of sin and false doctrines in the lump makes the whole lump full of sin/false doctrines/corruption.. Both of those pictures prophesy that the Kingdom was going to be corrupted,fully leavened, and inhabited by demons..

It could be interpreted that way if that were the context in which the remarks were given. Jesus, however, is clearly referring back to OT texts that speak of birds in a great tree as representing the Gentile nations (see Ezekiel 31:1-13; Daniel 4:12). He is most clearly alluding to the prophesy in Ezekiel 17:22-24 about Israel being such a tree that will one day gather in the Gentiles into the Church (Matthew 28:19).

[delchiante]

Um, how about the birds that eat the seed that falls on the wayside that He then referenced as the evil one in His parable of the sower?

And how about the 6,000 Legion that leaves the man and enters about 2,000 swine, an animal that is not allowed to be eaten or touched?
About 2,000 demon possessed swine years that matches the exact about 2,000 cubits Israel was to be kept from the ark before Passing Over?

There is more examples of the Kingdom being corrupted in the scriptures than the Church aka the Kingdom of Heaven on Earth wants to admit..

Go figure..
It sits pretty tall as a lawless Whore on the Beast.