Any atheist can deny what God can do since they do not know God or acknowledge his ability. Then you take the lack of scriptural knowledge of God and use that lacking to try to use reductionistic human concepts to reject the testimony of scripture. If God were only a single "person" rather than Trinitarian in essence, your argument would make some sense. However, your response is just using your denial of the Trinitarian nature to make your argument.God cannot be a Messenger of God.
God cannot be an Intercessor before God.
God cannot beget God.
God cannot send God to the world.
God cannot raise God from the dead.
God cannot deliver up the Kingdom to God.
God cannot sit at the right of God.
I encourage you, @civic and @praise_yeshua to stop the accumulation of logical contradictions, accept that you believe in the Trinity by faith, by choice, and that you embrace your Unitarian Christian neighbors (including @Studyman and @Peterlag) as brothers and sisters, saved by the same undeserved grace of God.
Anyhow, how do you know what God can and cannot do? What knowledge of God do you claim to have apart from the testimony of the Christian scriptures? Who do you know that was raised from the dead to testify to the accuracy of the message someone shared while alive on earth? It is only Christ who has been raised from the dead as the message of God first physically on earth and now in the heavens.