The Earth is a Globe, Period. Jesus Christ was in the Heart of the Earth - the Center of the Globe - for 3 Days and Nights.
"It is he that sitteth upon the globe of the earth, and the inhabitants thereof are as locusts: he that stretcheth out the heavens as nothing, and spreadeth them out as a tent to dwell in." (Isa 40:22, DRB, translated 100s of years ago)
"For as Jonah was three days and three nights in the belly of a huge fish, so the Son of Man will be three days and three nights in the heart of the earth." (Mat 12:40)
Flat Earth Myth is a lie promoted by Anti-Christian Atheists and Agnostics, and believed by some misguided Christians. The reality is, medieval Christians knew the Earth was a Globe, and even knew its (approximate) circumference. Here is the Reference:
"The
myth of the flat Earth, or the
flat earth error, is a modern
historical misconception that European scholars and educated people during the
Middle Ages believed the
Earth to be
flat.
[1][2]
... Historians of science
David Lindberg and
Ronald Numbers point out that "there was scarcely a Christian scholar of the Middle Ages who did not acknowledge [Earth's] sphericity and even know its approximate circumference".
[6]
...The myth that people in the Middle Ages thought the Earth is flat appears to date from the 17th century as part of the campaign by Protestants against Catholic teaching. But it gained currency in the 19th century, thanks to inaccurate histories such as John William Draper's
History of the Conflict Between Religion and Science (1874) and Andrew Dickson White's
A History of the Warfare of Science with Theology in Christendom (1896).
Atheists and agnostics championed the conflict thesis for their own purposes, but historical research gradually demonstrated that Draper and White had propagated more fantasy than fact in their efforts to prove that science and religion are locked in eternal conflict.[9]"
https://en.wikipedia.org/wiki/Myth_of_the_flat_Earth To Wikipedia's credit, at least it is setting the historical record straight.
I agree with you that, the flat earth is in error, but I will question your Catholic Bible (DRB).
Although, 100 years is a long time, the King James Bible, which is regarded by many as the gold standard for Protestants, is over 400 years old.
Most Bible translations translate it to, "circle of the earth", not "the globe of the earth" (DRB) in Isaiah 40:22. There is even a translation for flat earthers in the International Standard Version for it says, "the disc above the earth". These two Bible translations are definitely out of line of most translations. Before you ask, I don't believe in the flat earth, but Concave Hollow Earth, link is below.
https://christianchat.com/conspiracy-corruption-discussion-forum/concave-hollow-earth-theory.198187/
https://biblehub.com/isaiah/40-22.htm
Next you quoted Mathew 12:40, this translation is from NKJB.
For as Jonah was three days and three nights in the belly of the great fish, so will the Son of Man be three days and three nights in the heart of the earth.
So, what does mean by, "heart of the earth"? Most Bible translations have, heart of the earth.
https://biblehub.com/matthew/12-40.htm
In Luke 24:1-3, it says the the stone rolled away from the tomb, then they went in and did not find the body of Jesus. Well, it appears the body of Jesus wasn't placed in the heart of the earth, since they were able to easily walk in the tomb. Yes? No? Maybe so?
Luke 24:1-3
1Now on the first day of the week, very early in the morning, they, [a]and certain other women with them, came to the tomb bringing the spices which they had prepared. 2But they found the stone rolled away from the tomb. 3Then they went in and did not find the body of the Lord Jesus
But Mathew 12:40 was referring to the time, when he was dead for three days. Right?
Where did Jesus go in Mathew 12:40?
"the Son of Man be three days and three nights in the heart of the earth"
Where is the heart of the earth?
That depends if you believe in Concave Hollow Earth, or if you are a globalist.
Left is the globe earth, and right in the Concave Hollow Earth.
If your a globalist, you would naturally believe Jesus, went to hell for three days. If you are a caveman, and believe in the Concave Hollow Earth, you believe Jesus went to heaven for three days.
I personally believe Jesus didn't goto hell, but went to heaven.
2 Corinthians 5:8
We are confident, yes, well pleased rather to be absent from the body and to be present with the Lord.
I believe the Bible and the verses posted in this thread, help prove the Cellular Cosmology to be true.