Two Ways
Under "grace," justification is by faith alone without the deeds of the law.
(Ephesians 2:8-9 KJV) For by grace are ye saved through faith; and that not of yourselves: it is the gift of God: {9} Not of works, lest any man should boast.
(Titus 3:4-5 KJV) But after that the kindness and love of God our Saviour toward man appeared, {5} Not by works of righteousness which we have done, but according to his mercy he saved us, by the washing of regeneration, and renewing of the Holy Ghost;
Under "law," faith and works are needed for justification.
(James 2:14 KJV) What doth it profit, my brethren, though a man say he hath faith, and have not works? can faith save him?
(James 2:24 KJV) Ye see then how that by works a man is justified, and not by faith only.
It is clear there are two ways of salvation! Both are through the shed blood of Christ! One is for Israel, the other is for the church, the body of Christ. One is the subject of prophecy, the other the subject of the mystery. One is under the law, the other is under grace.
The question you have to ask yourself: "Which program is God working today?"
Do we go to Israel today to receive our instructions, as Isaiah 2:1-5, Micah 4:1-2 say, or has Israel fallen and temporarily been set aside as Romans 11:11,12,25,26, say?
Understanding these two programs is the real division in the Bible. This division is seen in Eph. 2:11-13, and this is what churches should teach.