Examine the DNA. It has the same double helix structure and chemical composition (Hydrogen, Oxygen, Nitrogen, Carbon, and Phosphorous) on all living things -- plants, trees, animals, insects, frogs, cats, dogs, humans, etc. In other words, we are all related. The banana you're eating right now is related to you. The only difference is the coding arrangement. It's like programming a software. Every piece of software is made up of 1s and 0s. According to the programming code, this software becomes a browser, and this becomes an operating system and this becomes a word processor. We can create so many types of software with just 1's and 0's. We can say that this word processor is related to a graphics software due to its 1's and 0's. They are just coded differently. It's the same with DNA. If we have the technology to program a DNA, we can create different types of living things.
If someone says to you, you're 98% related to an ape or homo erectus. That's correct. If someone says to you, you're 90% similar to mice, that's also correct. Because it's evident that out from one clay, the Lord created all living things, including humans.
With regards to evolution, there's so many human like skulls scattered around the globe dating hundreds of thousands of years. What if the Lord had used the process of evolution to create humans until it became Adam? What if the creation process took hundreds of thousands of years? Of course, relative to the Lord, it's just minutes to him. Relative to the Lord, it took only 6 days to create everything. But, relative to us, billions of years had transpired.
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With regards to the flood, I believe it happened. Yes, everything went under water. The volume of water is enough to cover everything. Do the math. That's not even a typo even though I know very well that the volume of water cannot possibly cover even the shortest mountain on earth. It's sounds contradictory, but it's not.
We have around a million volcanoes under the oceans. Imagine if all of it erupted at the same time as what the Bible said - the fountains of the great deep burst forth. We can imagine the tremendous mega earthquakes it had produced with all the plates moving and shifting about. Maybe it's in the magnitude of over 15. So severe that it collapsed the land and submerged it under water. All the waters of the oceans flowed violently towards the submerging masses of land. The earth literally imploded on itself. Imagine a dinner plate submerging into a sink of water. And it doesn't take a lot of water to submerge the whole plate. I believe this is exactly what happened when the whole earth was flooded.
The water did not flood the earth like overflowing a glass with water, rather, the earth sank underwater during Noah's flood. It's like the story of Atlantis sinking underwater.
Can land sink underwater by an earthquake? Yes, it can.
"An ancient, lost island in Turkey is set to be discovered by underwater archaeologists after being
submerged by a giant earthquake over 1,000 years ago."
Link
One might argue, "That's not flooding!". It is flooding because it's just a matter of perspective. What if you were a reporter during Noah's flood? You would feel the ground shaking violently as you record the whole event. It is raining very hard. You then saw water rushing throughout the city and it began to flood. You drove your car to the highest hill possible. You saw the whole city quickly being flooded until the water level reaches the tallest building. You ran towards the helicopter at the top of the hill. From the sky, you saw everything flooded until the city became an ocean. You flew to find dry ground, only to see it being covered by water quickly. You then saw the peak of the highest mountain being lowered slowly and only starting to realize that the land was sinking into the sea.
This was how Noah's flood happened.