Kunde's argument that God is not omnipotent because he is obligated to save all those who accept Jesus' sacrifice is not only an absurd claim, but it actually backfires against him.
The Quran says Allah has bound himself to give paradise as a reward to all those martyrs who murder people in the cause of their god:
Verily, Allah has purchased of the believers their lives and their properties; for the price that theirs shall be the Paradise. They fight in Allah's Cause, so they kill (others) and are killed. It is a promise in truth which is BINDING ON HIM in the Taurat (Torah) and the Injeel (Gospel) and the Qur'an. And who is truer to his covenant than Allah? Then rejoice in the bargain which you have concluded. That is the supreme success. S. 9:111 Hilali-Khan
Also notice what Muhammad is reported to have said:
It is narrated on the authority of Mu'adh b. Jabal: I was riding behind the Prophet and there was nothing between him and me but the rear part of the saddle, when he said: Mu'adh b. Jabal: To which I replied: At your beck and call, and at your pleasure, Messenger of Allah! He moved along for a few minutes, when again he said: Mu'adh b. Jabal: To which I replied: At your beck and call, and at your pleasure, Messenger of Allah! He then again moved along for a few minutes and said: Mu'adh b. Jabal: To which I replied. At your beck and call, and at your pleasure. Messenger of Allah He, (the Holy Prophet) said: Do you know what right has Allah upon His servants? I said: Allah and His Messenger know best. He (the Holy Prophet) said: Verily the right of Allah over His servants is that they should worship Him, not associating anything with Him. He (the Holy Prophet) with Mu'adh behind him, moved along for a few minutes and said: Mu'adh b. Jabal: To which I replied: At your beck and call, and at your pleasure, Messenger of Allah! He (the Holy Prophet) said: Do you know what rights have servants upon Allah in case they do it (i.e. they worship Allah without associating anything with Him)? I (Mu'adh b. Jabal) replied: Allah and His Messenger know best. (Upon this) he (the Holy Prophet) remarked: That He would not torment them (with the fire of Hell). (Sahih Muslim, Book 1, Number 46)
It is narrated on the authority of Mu'adh b. Jabal that the Messenger of Allah said: Mu'adh, do you know the right of Allah over His bondsmen? He (Mu'adh) said: Allah and His Apostle know best. He said: That Allah alone should be worshipped and nothing should be associated with Him. He (the Holy Prophet) said: What right have they (bondsmen) upon Him in case they do it? He (Mu'adh) said: Allah and His Apostle know best. He (the Holy Prophet) said: That He would not punish them. (Sahih Muslim, Book 1, Number 48)
Here Muhammad says that Muslims have rights over Allah just as he has rights over them. The right that Muslims have over Allah is that he must save them from punishment if they believe that there is no god besides him.
This is the height of blasphemy since no creature can ever claim any rights over God so that God must or is forced to do something for that creature.
As the Apostle Paul put it, no one will ever be able to boast before God or make him a debtor on account of what they have done:
"Oh, the depth of the riches of the wisdom and knowledge of God! How unsearchable his judgments,and his paths beyond tracing out! 'Who has known the mind of the Lord? Or who has been his counselor?' 'Who has ever given to God, that God should repay them?' For from him and through him and for him are all things. To him be the glory forever! Amen." Romans 11:33-36
"For it is by grace you have been saved, through faith—and this is not from yourselves, it is the gift of God—not by works, so that no one can boast. For we are God’s handiwork, created in Christ Jesus to do good works, which God prepared in advance for us to do." Ephesians 2:8-10
Paul was merely echoing what the OT writers had known and affirmed:
"If you are righteous, what do you give to him? Or what does he receive from your hand?" Job 35:7
"Who then is he who can stand before me? Who has first given to me, that I should repay him? Whatever is under the whole heaven is mine." Job 41:10b-11
This next hadith is even worse:
It is narrated on the authority of Mu'adh b. Jabal that he observed: I was riding behind the Messenger of Allah on an ass known as 'Ufair. He (Mu'adh) observed: He (the Holy Prophet) said: Mu'adh, do you know what right has Allah over His bondsmen and what right have His bondsmen over Him? Mu'adh added: I replied: Allah and his Messenger know best. Upon this he (the Holy Prophet remarked: The right of Allah over His bondsmen is that they should worship Allah and should not associate anything with Him, and the right of His bondsmen over Allah, Glorious and Sublime, is that He does not punish him who associates not anything with Him. He (Mu'adh) added: I said to the Messenger of Allah: Should I then give the tidings to the people? He (the Holy Prophet) said: Do not tell them this GOOD NEWS, for they would trust in it alone. (Sahih Muslim, Book 1, Number 47)
Not only do Muslims have rights over Allah, thereby making Allah impotent per Kunde's logic, this hadith also exposes Muhammad as a transgressor who willfully broke Allah's orders. For instance, the Quran tells Muhammad that he has to convey the message he receives from his impotent deity:
O Messenger (Muhammad)! Proclaim (the Message) which has been sent down to you from your Lord. And if you do not, then you have not conveyed His Message. Allah will protect you from mankind. Verily, Allah guides not the people who disbelieve. S. 5:67 Hilali-Khan
Allah warns Muhammad to convey his message to mankind, otherwise he will fail in his mission if he doesn't do so.
Yet according to the above hadith Muhammad hid some of the so-called revelation from his followers and forbids Muadh from making known to the rest of the Muslims an important piece of information which Allah had supposedly given to him and which he himself called good news!
What makes this all the more intriguing is that Muadh obviously didn't listen to Muhammad and chose to dishonor his prophet by publishing this information to the rest of the Muslims. After all, we wouldn't have known this piece of information had Muadh not opened his mouth and told it to others.
This now places Kunde in a bit of a dilemma. If Allah has bound himself by a promise to give his jihadists paradise for killing and being killed in his cause, and if he has also committed himself to saving Muslims from punishment because of their confessing and believing that he is the only deity worthy of worship then this makes him impotent since he cannot do otherwise. However, if Allah isn't under any necessary obligation to save anyone and doesn't have to commit to keeping his promise or fulfilling his obligation to his servants then this means that Allah is a lying, deceitful, capricious deity who cannot be taken at his word. Such a god cannot be trusted and is unworthy of being worshiped.
So much for Kunde's logic.