Rather simple…created things reflect their creator. Automobiles aren’t made to accommodate sea horses as drivers…they fit the humans that created them…gas and brake pedals where the feet go…steering wheel where the hands go….radio and AC and window controls within reach of the driver, etc. If you had only a car you could reverse engineer an approximation of what type of creature it was designed by.
The bible says: “The heavens declare the glory of God; and the firmament sheweth his handywork.” – Psalms 19:1
And just to make sure no one missed it, God repeated and clarified it again in Romans 1:20 – “For the invisible things of him from the creation of the world are clearly seen, being understood by the things that are made, even his eternal power and Godhead; so that they are without excuse:”
Without excuse…that’s what it says. Anyone who looks at the universe God made and refuses to believe in God has no excuse.
As for which God….that also is not complicated to figure out because, as I said, created things reflect their creator. So when you look at this world you see things that have 3 dimensions (length, width, height) and they exist in time which consists of (past, present, future) and the objects in the world are animal, vegetable or mineral. Humans are men women or children. Light comes in RGB colors. Matter can be seen in 3 states, solid, liquid, gas [plasma is seldom seen naturally occurring] and even the atoms which you see on the surface of everything consist of protons, electrons, and neutrons…when you look up in the sky it is either day night or transitioning…in the sky you see sun, moon, and stars.
I’ll not belabor the point…the universe is screaming at you that it was made by a 3 part being. Everything your eyes have ever seen during every second you have been alive have showed you this repeating pattern of threes.
So, if you want to know who created this, you eliminate religions that have a “god” that is not a 3 part being. What remains is a short list.