Amen! Those who teach conditional salvation will typically end up confusing 'descriptive' passages of scripture with 'prescriptive' passages of scripture and the end result is what I call "type 2 works salvation" or salvation by works at the back door. Believers walk according to the Spirit BECAUSE they are in Christ Jesus and not in order to be in Christ Jesus and/or keep themselves saved. To not walk according to the flesh but according to the Spirit is a confirmation that one is in Christ Jesus.It's conditional alright, conditional on Christ's obedience, not ours. I'd hate to usurp His righteousness and replace it with my own.
Romans 5:19 ASV
For as through the one man's disobedience the many were made sinners, even so through the obedience of the one shall the many be made righteous.
Romans 8:8 - So then, those who are in the flesh cannot please God. 9 But you are not in the flesh but in the Spirit, if indeed the Spirit of God dwells in you. Now if anyone does not have the Spirit of Christ, he is not His. 10 And if Christ is in you, the body is dead because of sin, but the Spirit is life because of righteousness.