Abram doubted for 24 years what God said

he started with doubt: [Seeing I go Childless] - he saw himself childless

Proverbs 23:7

⁷ For as he thinketh in his heart, so is he: Eat and drink, saith he to thee; but his heart is not with thee.

Genesis 15:2-3

2 And Abram said, Lord God, what wilt thou give me, seeing I go childless, and the steward of my house is this Eliezer of Damascus?

3 And Abram said, Behold, to me thou hast given no seed: and, lo, one born in my house is mine heir.

God changed Abram’s name to Abraham

Abraham means the father of many nations

Genesis 17:1-8

17 And when Abram was ninety years old and nine, the Lord appeared to Abram, and said unto him, I am the Almighty God; walk before me, and be thou perfect.

2 And I will make my covenant between me and thee, and will multiply thee exceedingly.

3 And Abram fell on his face: and God talked with him, saying,

4 As for me, behold, my covenant is with thee, and thou shalt be a father of many nations.

5 Neither shall thy name any more be called Abram, but thy name shall be Abraham; for a father of many nations have I made thee.

6 And I will make thee exceeding fruitful, and I will make nations of thee, and kings shall come out of thee.

7 And I will establish my covenant between me and thee and thy seed after thee in their generations for an everlasting covenant, to be a God unto thee, and to thy seed after thee.

8 And I will give unto thee, and to thy seed after thee, the land wherein thou art a stranger, all the land of Canaan, for an everlasting possession; and I will be their God.

Habakkuk 2:2

² And the Lord answered me, and said, Write the vision, and make it plain upon tables, that he may run that readeth it.

God gave him a way to visualize what he had promised him

Faith comes by hearing

Romans 10:17 - So then faith cometh by hearing, and hearing by the word of God.

Abraham now Believes

He didn’t have to wait 25 years to believe

He could have believed at day #1 when he was 75.

Romans 4:20-21

20 He staggered not at the promise of God through unbelief; but was strong in faith, giving glory to God;

21 And being fully persuaded that, what he had promised, he was able also to perform.

Once God changed his name, the promise child came in a year when he started using his faith.