That's a misrepresentation of prosperity doctrine. The Bible teaches that Israel had a covenant with Jehovah that would provide physical and financial blessings if they would keep the law. Hebrews 8:6 says that we have a better covenant based on better promises, so if they had prosperity in their covenant surely we should have it in ours.
God blessed them, so he must bless us even more?
He has.
We are living post the cross and resurrection. We know Jesus, have the Holy Scriptures and can ask God himself to live in us. We have EVERY spiritual blessing in Christ, Ephesians 1:3.
Proverbs tells us to seek wisdom which will bring riches, honor, and long life. (Prov. 3:16; 8:18) The Psalmist said "no good thing will He withhold from them that walk uprightly" (Ps. 84:11) and that the man who meditates constantly on God's Word will prosper in whatever he does. (Ps. 1:1-3)
Sorry, but that sounds like finding a few Bible verses to support a theory.
Jesus commended a poor widow who gave everything, Luke 21:1-4 He said it was hard for a rich man to enter the kingdom of heaven, Matthew 19:23-26, and did not promise that his followers would be financially well off.
He told Judas that they would always have the poor with them, John 12:8.
The early church shared their possessions and gave everything. They did not pray for/claim financial blessings. They took a collection for the poorer churches; they did not send them sermons on praying for finances from God.
Abraham, Isaac, Jacob, Job, David, and Solomon were all blessed financially, so if God is no respecter of persons He must be willing to bless us financially if we meet the conditions.
Firstly, that is making it conditional. If we do our bit, God will respond; like a celestial Santa Claus.
Secondly, that is an assumption; you could equally say that Job suffered, so if God is no respecter of persons that we should suffer too.
Not sure that David is the best example to give - he was an adulterer and a murderer, could not control his sons, who fought each other and raped their sister, 2 Samuel 13:1-14, and people fought for his crown after he died. There was a "golden age" in Israel while David was king, true. But look how many battles he had to fight to get peace.
Solomon was wealthy - at least some of that came from other people who came to visit him/see what God had done for him and brought him gifts, jewels and money.
He also had 700 wives and 300 concubines who led him astray, 1 Kings 11:3, turned away from God and did not follow his laws, 1 Kings 11:9-11. He probably died incredibly rich, but away from God - I know which of those I'd rather have.
I suppose it depends on how you define prosperity.