Q about arguments for God's existence.

[Whateverist]

options:
All religions are equally true
All religions are equally false
Only my religion is true

There's another option:

All religions that recognize God hold that truth and so share in that truth.
Jesus is God incarnate and is the full truth and the way to salvation.
Those who follow Christ share in the full truth.

Although it's true that we tend to accept what we are taught when we are young, we often reject that as we get older and make our decisions on our own. Most Muslims have never heard Christian teachings and wouldn't be able to make a decision in that regard and vice versa. Churches around the world, though, have many people who were raised in different faiths.

Doesn't your other option generalize as "all religions have the potential to be as true for those who have not yet discovered them". Not a very important point imo.

I personally will have to go with choice #1, "all religions are equally true". Looked at from the point of view of anthropology, they all serve a similar purpose. For those who hold a religion as true, the way they filter reality will be imbued with it to some degree. Some fear that such beliefs are contaminants that can only defile our grasp of reality. But I think they are more like incense. Some people just like the way reality smells better when they are 'lit' by religion.