People have what is known as "a conscience." They have "a gut feeling." they have "intuition." They have interaction with others as well.
Here's the thing; GOD IS IN US ALL! God is always in us, all the time. We all have God... every, single, one of us! Regardless of our language, our skin color, our location on the map, what the name of the building we worship in is called, skinny, fat, tall, short, male, female... GOD IS IN ALL OF US! We have our "standard" by that constant. No one lacks God. it is impossible to lack God. God is us, and we are God. I don't need any ancient text to say that for me to KNOW THAT!
You can refuse to accept that. But, your refusal makes it no less true and abundantly clear to me.