The axiom of the theological worldview is to define God as eternal exitent, transcending time space. For an object that transcends time and space a beginning is not a rational concept if you accept that causality is a time dependent function. If not - please explain your concept of causality which must be interesting.
Now if you look at time we all seem to agree that the universe had a beginning. If the universe would be infinite in its existence it should have reached equilibrium as far as I understand thermodynamics unless you propose the addition of energy into the universe from outside of it, and even even if you would propose a cycling / oscillating universe you would have the same dilemma. So if you have any evidence that physical reality has no beginning but is past eternal claim the nobel prize for it as everyone is waiting for that. As far as I understand no one has done so so far, and the Borde-Vilenkin-Guth theorem proved that any universe which has been on average expanding cannot be past eternal.
If you look at websites like “Why doesn’t God heal amputees” from Marschall Brain you will see that atheists demand miracles such as spontaneous regrowth of limbs of healing from heart disease upon prayer etc, so it is clearly atheists that demand magic as a proof of God. It does not get you of the hook saying that there are Christians that believe that God does magic, but then there are a lot of materialists that believe to be Christians. As an intellectual one should be aware of the conflict and incoherence such thinking creates, Thus to demand incoherence in the argument from your opposition of intellectually dishonest.