Umm, as said, Romans 9 speaks also of the Gentiles and how they are to be saved which I did quote and perhaps have it misled if one do not want to continue the reading of it. Paul speaks of attaining righteousness which is of faith, v. 30 and so with v.33 which states "whosoever believeth on him" is conditional. My another try:
Rom 9:30 What shall we say then? That the Gentiles, which followed not after righteousness, have attained to righteousness, even the righteousness which is of faith.
Rom 9:31 But Israel, which followed after the law of righteousness, hath not attained to the law of righteousness.
Rom 9:32 Wherefore? Because they sought it not by faith, but as it were by the works of the law. For they stumbled at that stumblingstone;
Rom 9:33 As it is written, Behold, I lay in Sion a stumblingstone and rock of offence: and whosoever believeth on him shall not be ashamed.