We are all born with the condition of sin in the flesh...
Sin in our members (sin in the flesh) is, as you said, a condition. We are born bent-to-self, which simply means we are born loving ourselves. In other words we are born self-centered or selfish. Hence the clamors of our fallen nature, through the members of our body, tempt the mind to sin.
...the discussion has been that Christ had sin in His flesh as we do...which is clearly not the truth of scripture and I believe is blasphemy against Christ.
"Christ had..."? Hmmm? Who is Christ? Didn't Christ exist before the incarnation? Yes. Therefore the answer is
Christ is God. So God never HAD (your words) "sin in the flesh".
But...at the incarnation Jesus as God united Himself to our corporate humanity, in the womb of Mary, that need redeeming.
What type of humanity did Mary possess? Wasn't it a fallen one, indwelt with our condition?
So the only thing she could pass on to Christ, as the son of man, was a life indwelt by iniquity (our "bent"). Otherwise you must teach what the Catholic teaches, that is, the immaculate conception.
Now why did Christ as God have to legally assume our fallen life from Adam?
Answer: Because God's law demands two things:
1] Obedience, perfect obedience.
2] Death to those who fail
By assuming us, Christ as the son of man (called "the last Adam") lived a perfect life in our fallen humanity. He never sinned even by a thought. He did this because He was born spiritually alive and therefore the clamors of our nature, which He assumed for about 33 years, never got the better of Him. This answered # 1.
But because He assumed us in our fallen condition, our life from Adam had to die. And it did "in Christ Jesus" (see Rom 6:6/7:4). Hence the justice of the law has been legally established. This answered # 2.
IF Christ assumed our humanity before the fall (that didn't need redeeming) the law still remains unsatisfied and therefore you, the sinner, must answer the demands of the law yourself. That means that you have to obey perfectly, but if you sin you must die. My Bible tells me "all have sinned" and all are continuing to fall short of God's agape love. See Rom 3:23
So this vicarious gospel, that you present, removes Christ from what He came to do, that is, save sinners, legally and morally according to God's own law.