Not just the christian god, any god.
If they were real it would be self evident.
From a guy who spend decades as a preacher:
“Christians go in with their god as an assumption rather than a conclusion. When in fact, after close examination, the virgin birth falls apart, the resurrection falls apart, the basis of morality falls apart, the promise of afterlife fizzles into fear based marketing.”
“The gods of Islam, of Judaism, of Christianity only exist in scripture. If they actually existed, we wouldn’t need the books to claim they did. Once the book fails, the god goes with it.”
Feel free to explain why he is wrong or right.
But you don't need a book so the OP and the quoted author are wrong.
If you didn't have a Bible or couldn't read / comprehend, or didn't have a Congregation to go to, everything you'd need would be sitting there all along (like cliff notes) in the name and legend of the Holy City of YeruShalem.
From containing the descriptive name describing the Essence of God, to describing our purpose and direction / path ( so it's not subjective), to the short version and conclusion to the battle between the fallen message / messenger and the overturner-rising rightful messenger, being in the legend of how YeruShalem becomes the city of peace.
Like I said everything in the beacon/ focus that is the HOLY CITY.
So without the Bible everything is still there in the single holy name.
It's essential to define that power & source of Life (God) in order to know our purpose, place, path, and thus know if we are in line (doing good) or going against the grain (doing evil).
The Torah tells us God's Essence is in the city's name, Shalem means completeness -wholeness, Stability, which is why Genesis says God creates order out of chaos, not out of nothing.
Knowing/describing that essence in life helps discern from subjective opinions on what is in line or against the grain (right or wrong, good or bad).
So ask yourself is that Shalem(stable,becoming complete) or opposition to Shalem(chaotic & divisive) to know good from evil without it being mere subjective opinion.
Like I said many times, the holy name is like cliff notes which is why the city is our focus and Iris of the Eye of God.
Sources:
YeruShalem would carry the name. (1 Kings 11:36 &
in dead sea scrolls: Words of the Archangel Michael scroll 4Q529, 6Q23)
The Gemarah (Baba Batra 75) Tells us Jerusalem is named after G0D and is the place commemorating his name and essence. In Sefer D’varim (12:5, 11, 14, 18, 21; 14:23,24, 25; 15:20; 16:2, 6, 7, 11, 15, 16; 17:8, 10; 18:6; 26:2; 31:11).the place that I will choose to place My Name. That is referring to YeruShalem because Sifri identifies the place which Hashem will choose (12:18) as “Yerushalayim”.
Type: "David named 2 sons after Shalem"
in google search.