Being faithful to God won't make you prosperous. The blessings that God promised Israel are not the same blessings that God promised to the church. The blessings for the church are spiritual in nature.

Eph 1:3 Praise be to the God and Father of our Lord Jesus Christ, who has blessed us in the heavenly realms with every spiritual blessing in Christ.
Eph 1:4 For he chose us in him before the creation of the world to be holy and blameless in his sight. In love
Eph 1:5 he predestined us to be adopted as his sons through Jesus Christ, in accordance with his pleasure and will--
Eph 1:6 to the praise of his glorious grace, which he has freely given us in the One he loves.
Eph 1:7 In him we have redemption through his blood, the forgiveness of sins, in accordance with the riches of God's grace
Eph 1:8 that he lavished on us with all wisdom and understanding.
Eph 1:9 And he made known to us the mystery of his will according to his good pleasure, which he purposed in Christ,
Eph 1:10 to be put into effect when the times will have reached their fulfillment--to bring all things in heaven and on earth together under one head, even Christ.
Eph 1:11 In him we were also chosen, having been predestined according to the plan of him who works out everything in conformity with the purpose of his will,
Eph 1:12 in order that we, who were the first to hope in Christ, might be for the praise of his glory.