John 7:57 - 8:11 and the longer ending of Mark are well-known questionable passages. Neither carries any major doctrine that can't be found elsewhere. The other two verses are in a single translation, and neither has any bearing on one's salvation.
Now Romans 8:1 does in fact have an omission in it in certain versions that will affect the salvation of those who adhere to such translations.
"who walk not after the flesh but after the Spirit" is omitted.
Please note here that if the kjv is correct in this instance, then there is no condemnation for those who are in Christ Jesus; who are defined as those who walk not after the flesh but after the Spirit.
When the latter part is taken out, someone is given room to believe that they are in Christ Jesus even if they consistently walk according to the flesh.
But if the kjv is correct, then there is condemnation for those who walk after the flesh. Thus the modern translations might give the reader an impression that will give him a false hope; and trusting in that hope he will not come into a saving knowledge of Jesus Christ. For in reading the modern translation, they may believe that they are in Christ Jesus when in all reality they are not.
Thus, in some tranlsations, Romans 8:1 does not stand on its own as a bastion of biblical truth.
While it can be determined, from looking at Romans 8:12-14, that the kjv's rendering is in fact correct; whatever translation you are looking at.
For it is written in those verses that if you live according to the flesh, you will die; but that if you put to death the deeds of the body by the power of the Holy Spirit, you will live.
I for one do not want to take any chances on some teaching that this is not talking about spiritualt and eternal death.
For someone might indeed interpret it as saying that if we walk according to the flesh we will die physically.
However, that would indicate that we will not die physically if we put to death the deeds of the body in the power of the Spirit.
Therefore I conclude that Romans 8:12-14 is talking about spiritual and eternal life and death.
And therefore, Romans 8:1, in the kjv, is the accurate rendering; where the latter end of the verse is not removed.