As someone said before in this topic this is an easy question. Stop me if you heard this before.
One day a lad and his friends found a tall, old tree lying on the ground next to a stream in the forest. One boy asked another, "When this tree fell with no one around was there sound made?" One gave this answer. "Yes, the by law of physics in this universe that has time, space, and energy a sound was made upon the falling of this tree AND No, no sound was made because God could have put it there this morning for us to find. With no witnesses, there is no proof. Think about it.
The reasoning is that faith can move mountains. Lewis and Clark could have been transversing the Bitterroot Mountains and be men of faith gloryifing God doing so. God could have taken that faith and moved the last mountain range in their path and thrown it in the sea knowing no one that had seen that range would ever return to that spot and notice the missing peaks. It is quite a story of them in the snow what is now Idaho.
About the Big Bang Theory. That is easy too. Without time, there is no space. Without space, there is no time. Without time or space there is no energy to transfer, no mass to move. Thus the Big Bang was the incorporation of time and space into the universe. Okay, that has been said before by others, but I thought of that as a lad in grades school. So what exists without time and space? Easy, a universe with the three spatial directions. Don't waste your time contemplating if x, y, or z was first. With no time, space, mass, energy that 3-D universe was completely filled and empty. Trinity comes to mind. Wait a minute, even with time and space present, that 3-D only universe is still existing or bluntly as existed and will always exist. The age of the universe is a big lie; we cannot know when it started, just that it did. And that space/time will be gone too eventually. One more thing about dimensions; who is to say that a dimension cannot pop in-and-out of existence. Thought, emotions, love cannot be explained by the four dimensions, thus there are higher dimensions. Do you not feel like a new creation when you forgive or love? Who's to say you do not bring into existence a new dimension when you do?
I believe though I do not see.
PS If your son still won't believe, then contact me about viewing a one-hour show on youtube that proves blackholes, neutron stars and such are make believe (these guys can show in th lab 17 characteritics of "neutron stars") so to illustrate to your son that science folks can get it wrong too. Before you guys call me cooky, you believe some guy can bring you back from the dead? Give yourself one hour of time and you will see many lies uncovered by the simple truth of plama and electricity. Remember, this post is here to help a youngster come back to Mass.