Following the logic of dictionary.com we, as Christians should believe in the earth and not The Earth, for the earth is earth and earth is the earth. When an athiest says: "The Earth", they refer to a specific fictitious place in their mind as a ball floating around, just as important as Sol or Jupiter. But, since there is but one place we live, it is earth, then let it be "earth"
Genesis 1:1 says: "אָ֫רֶץ" when it says "בְּרֵאשִׁ֖ית בָּרָ֣א אֱלֹהִ֑ים אֵ֥ת הַשָּׁמַ֖יִם וְאֵ֥ת הָאָֽרֶץ׃" or "In the beginning Elohim created the heavens and the land". Most translations say "The Earth" (even the so-called incorruptible King James Version. Instead, I will chose to call it what Moses called it: "land" or "earth". Below is the following rule from Dictionary.com. Remember, they are speaking of a place that does not exist and therefore has a specific proper name instead of the truth which is: "this is land, here and no other place in the universe is there land but here and so let's call it: earth, because it is".
Below is a quote from Dictionary.com
"When it comes to writing, this common English word confuses many native speakers who aren’t sure whether to use Earth or earth. Why is this an issue? Earth can be either a proper noun or a common noun. In English, proper nouns (nouns which signify a particular person, place, or thing) are capitalized. Following this rule, when Earth is discussed as a specific planet or celestial body, it is capitalized: It takes six to eight months to travel from Earth to Mars. When Earth is a proper noun, the is usually omitted."
Below is a quote from Dictionary.com
"When it comes to writing, this common English word confuses many native speakers who aren’t sure whether to use Earth or earth. Why is this an issue? Earth can be either a proper noun or a common noun. In English, proper nouns (nouns which signify a particular person, place, or thing) are capitalized. Following this rule, when Earth is discussed as a specific planet or celestial body, it is capitalized: It takes six to eight months to travel from Earth to Mars. When Earth is a proper noun, the is usually omitted."