Why is the idea of God more unreasonable to many people than the Big Bang? That idea seems much more silly to me than the idea of our very detailed and complicated universe being designed by a great Designer.
He made this game of life and each of us characters. We are trapped in this very real universe which is actually just a thought of a Designer called God. The one rule He gave Himself was to never mess with free will.
The first few hundred humans decided to do Life the hard way and be jerks to each other. After life had been going on for a while, God realized humanity, (all of us mini gods who think we control life) were mostly ungrateful jerks, so he wiped the world clean with the flood and started again with different humans who ended up becoming jerks so God gave them a few rules. Unfortunately the rules weren’t enough to stop humans, so He made a plan.
Make Himself into a human, go into the game and tell the characters that they don’t have to worry and treat others bad. Life is amazing and we get to love it and each other and we should love God because He made it all and even became human so that all of us would know that He, God, knows it’s hard to be human. It is for all of us, but it will be over one day.
When we die, we are either trapped in the game as ghosts, or we go meet the Designer and we find out this reality was just a thought.
It helps if you know the Designer but He gives us control of that. Have fun playing your roll. Recognize the beauty in the world and each other. Love is the answer.