If all of Israel was saved,
Well they were. They had to be, because the message was a spiritual message and one that spiritually dead people couldn't even understand much less accept. However we know that Israel should have understood this message, especially the "teachers" in Israel. Just another proof that they were saved.
Jesus came not to preach eternal life but instead came to preach the kingdom, why were they excluded from the kingdom?
Well He did preach eternal life. And as has been shown to you many times in the past your view and the view of 21st century Christendom regarding "eternal" is skewed.
Israel was excluded from the Kingdom because the nation didn't accept the national offer. However there was a remnant as always that did accept the Truth and they will be a part of the kingdom of the heavens. But it was a national offer.
Nobody behaves in a Christ like manner 100% of the time, therefore there are NO saved Christians. (according to your bizarre theology)
And here is where you make one of your biggest mistakes Amy. No one is talking about absolute perfection. Of course no one behaves in a Christ-like manner 100% of the time. One just need read this board for a fews days to see evidence of this unfortunate Truth.
However, because God knows that we are still imperfect and that our sin nature has not been competely done away with He has given us and Advocate, Whose blood still remains on the mercy seat. And while we can not be 100% perfect we can be blameless. And that's all we are asked to be.
Elizabeth and Zachariah were said to be blameless when it came to the law. Does that mean they were perfect? Of course not. But when they broke the law they made amends according to the law.
Paul said the same of himself.
We still have rules to live by. And if we run outside the lines we can confess and He is faithful and just to forgive us our sins and cleanse us. And when we avail ourselves of the blood of Christ then we are blameless. However if we do not confess and we do not avail ourselves of the blood of Christ then we are not blameless. We are guilty as charged.
You can see this truth in the footwashing ceremony where it says we have all received our complete bath. But we continue to get contaminated with the world and are in need of periodic cleansing. And Jesus said if we do not allow Him to wash us then we will have not part "with" Him. Notice it doesn't say "in" Him, it says "with" Him.
This is taken from the OT type of the priests getting a complete washing before entering into the priesthood. It was never repeated (another example of why once saved always saved is true by the way), but they had to wash at the laver before they could enter the Holy of Holies.
Again this doctrine is taught from the beginning of Scripture until the end. And that is one of the biggest problems with church tradition is that you can't find any teaching in the OT in type. And so what folks have done is say well you can't teach doctrine from types. That excuses them of having to find "their" doctrine in the whole council of God.