Of course they can, but it doesn't make it so. We have the Truth, given to us as the Word of God, and we have faith given to us as a gift. Truth is not subjective, no matter what those who would lie, distort it to be. All liars have as their father the devil. All those who love the Truth, have as their Father, God.
You have faith that it is the truth, you do not have fact that it is the truth.
I hope you realize the difference.
And they base their faiths on as much evidence as you base yours.