Not so. Not at all.
Christian arguments are not fideist. They do not rest solely on revealed truth in a vacuum. Christian arguments partake also of reason and natural law, neither of which requires divine authority to be credible.
God says sodomy is bad and we agree. Statistics show that homos have a high incidence of drug, alcohol and physical abuse among each other and that makes sense to us. But we can't prove that their problem is spiritual and the other side is successfully saying that a lack of acceptance is why they are emotionally troubled.
At some point "God said it, I believe it, that settles it" is the only argument a Christian has.