but friend, God doesn't say to Abraham that 'he probably will be the father of man, but maybe not, depending on man's will which even being God I can't control or fully predict since there really is no such thing as knowledge of the future'
God says Abraham already has been made the father of many nations, past fully completed action in the Greek grammar which is very specific.
Paul, speaking by the inspiration of God, calls this evidence that God speaks of things which have not happened as if they have.
Ex.32:7 And the Lord said unto Moses, Go, get thee down; for thy people, which thou broughtest out of the land of Egypt, have corrupted themselves:
8 They have turned aside quickly out of the way which I commanded them: they have made them a molten calf, and have worshipped it, and have sacrificed thereunto, and said, These be thy gods, O Israel, which have brought thee up out of the land of Egypt.
9 And the Lord said unto Moses, I have seen this people, and, behold, it is a stiffnecked people:
10
Now therefore let me alone, that my wrath may wax hot against them, and that I may consume them: and I will make of thee a great nation.
11 And Moses besought the Lord his God, and said, Lord, why doth thy wrath wax hot against thy people, which thou hast brought forth out of the land of Egypt with great power, and with a mighty hand?
12
Wherefore should the Egyptians speak, and say, For mischief did he bring them out, to slay them in the mountains, and to consume them from the face of the earth? Turn from thy fierce wrath, and repent of this evil against thy people.
13 Remember Abraham, Isaac, and Israel, thy servants, to whom thou swarest by thine own self, and saidst unto them, I will multiply your seed as the stars of heaven, and all this land that I have spoken of will I give unto your seed, and they shall inherit it for ever.
14
And the Lord repented of the evil which he thought to do unto his people.
Deut 9:6 Understand therefore, that the Lord thy God giveth thee not this good land to possess it for thy righteousness; for thou art a stiffnecked people.
7 Remember, and forget not, how thou provokedst the Lord thy God to wrath in the wilderness: from the day that thou didst depart out of the land of Egypt, until ye came unto this place, ye have been rebellious against the Lord.
8
Also in Horeb ye provoked the Lord to wrath, so that the Lord was angry with you to have destroyed you.
9 When I was gone up into the mount to receive the tables of stone, even the tables of the covenant which the Lord made with you, then I abode in the mount forty days and forty nights, I neither did eat bread nor drink water:
10 And the Lord delivered unto me two tables of stone written with the finger of God; and on them was written according to all the words, which the Lord spake with you in the mount out of the midst of the fire in the day of the assembly.
11 And it came to pass at the end of forty days and forty nights, that the Lord gave me the two tables of stone, even the tables of the covenant.
12 And the Lord said unto me, Arise, get thee down quickly from hence; for thy people which thou hast brought forth out of Egypt have corrupted themselves; they are quickly turned aside out of the way which I commanded them; they have made them a molten image.
13 Furthermore the Lord spake unto me, saying, I have seen this people, and, behold, it is a stiffnecked people:
14
Let me alone, that I may destroy them, and blot out their name from under heaven: and I will make of thee a nation mightier and greater than they.
15 So I turned and came down from the mount, and the mount burned with fire: and the two tables of the covenant were in my two hands.
16 And I looked, and, behold, ye had sinned against the Lord your God, and had made you a molten calf: ye had turned aside quickly out of the way which the Lord had commanded you.
17 And I took the two tables, and cast them out of my two hands, and brake them before your eyes.
18 And I fell down before the Lord, as at the first, forty days and forty nights: I did neither eat bread, nor drink water, because of all your sins which ye sinned, in doing wickedly in the sight of the Lord, to provoke him to anger.
19 For I was afraid of the anger and hot displeasure, wherewith the Lord was wroth against you to destroy you. But the Lord hearkened unto me at that time also.
20 And the Lord was very angry with Aaron to have destroyed him: and I prayed for Aaron also the same time.
Psa 106:19
They made a calf in Horeb, and worshipped the molten image.
Psa 106:20
Thus they changed their glory into the similitude of an ox that eateth grass.
Psa 106:21
They forgat God their saviour, which had done great things in Egypt;
Psa 106:22
Wondrous works in the land of Ham,
and terrible things by the Red sea.
Psa 106:23
Therefore he said that he would destroy them, had not Moses his chosen stood before him in the breach, to turn away his wrath, lest he should destroy them.
God intended to destroy the Israelites and make of Moses a great nation in their place. He changed His mind. The Ever-existing is God. He can change His mind, if He decides to do so. Who are you, O man, to contradict God, and to tell us that he cannot change His mind, when He gives numerous examples in scripture of Himself doing just that.
You should not be formulating a set of propositions about what kind of God
you would find worthy of worship, and then spend so much time and energy trying to convince people that scripture cannot not mean what it says, because if it did, it would present a God who does not conform to the model of Deity you have formulated for yourself, or someone else formulated for you.