can other denominations be saved?

14 For if they which are of the law be heirs, faith is made void, and the promise made of none effect:

They which were of the law in Paul's day were the Jews - who were saying that only the Jews could be saved.
Denominations (J'W's, Mormans, Catholics, SDA's) say that only they can be saved.

The bible says it doesn't matter who you are, if you have faith in Christ, you are righteous.

No they can not be saved as most know the law but do not do the research. They rather listen to people and agree with there doctrine than do the work for them self's.

fair comment...but if you are sincere and live up to the light you know...wherever you are (heathen, catholic, protestant) by obeying the holy Spirit, you shall be saved?

Mathew 7:13 - 14