What was questioned? That there were other religions prior to Judaism and Christianity that shared a lot of similarities.
It is a tough one. We are not taught about other cultures or their beliefs. We have a tendency to jus teach that our way is the right way and that others are false religions that are spread by the devil. The problem is that the devil uses truth in his lies, so how do you tell what is true and what is false when confronted with both?
Gen 11:3 And they said to one another, “Come, let us make bricks, and burn them thoroughly.” And they had brick for stone, and bitumen for mortar. 4 Then they said, “Come, let us build ourselves a city and a tower with its top in the heavens, and let us make a name for ourselves, lest we be dispersed over the face of the whole earth.”
The tower of Bable. Led by King Nimrod, the tower was to reach up to the heavens so that if God decided to drown the world again, they could withstand the floods and survive. We don’t see this in the Bible, but the stories are out there. Does that mean that since the story is shared that what is in the Bible is not true? No. It just means that there is additional truth that can be obtained from other sources. I am not sure why God left it out, but these other sources seem to validate the stories in the Bible instead of discount them.
The story of Noah and the flood. There is a similar story in the Epic of Gilgamesh. The flood was not the whole world, but salvation was found in a boat. Does this mean that Noah is just a copy and not the truth? No. How do we know that the story in the epic was not a retelling of Noah. These stories were all told in oral traditions. Cultures would hear the stories and adapt it to fit into their history. You see the truth of God through out different cultures because of this.
Jonah fought God because he didn’t want to tell the people of Nineveh they needed to repent or God would destroy them. When they were told, they responded and repented. God was known by other cultures and people. Does that mean that their religions are the way to heaven as well? No. Jesus said He is the ONLY way. That is the difference.
Other religions will contain true aspects of God, but they are also mixed with pagan beliefs that were introduced by Satan. How do we know that our religion is the right one. Faith alone. That is the hardest aspect of the religion. There is enough proof out there to give people faith, but it is by faith alone that we are saved. Our religion has stood through the ages because we are based on the one true God. Other religions fall to the side and fail because they are not based on truth. Parts of truth will be used by other religions, but when faced with the whole truth of God, they can not stand.
When confronted with questions that challenge our beliefs, all we can really do is submit them to God for answers. Let it go and pray about it and the answers will be provided to you. Maybe not a strong enough answer to convince other people, but answers that will strengthen the one questioning. Have faith that God is real and true and He will reward that faith with a relationship with Him.