Agnosticism is built on the underlying assumption, indeed a kind of faith, that the process of questioning that we have at our disposal (which is very, very limited) will lead to truth. There are atheists who were Christians, became agnostics and then eventually succumbed to atheism. Despite what these people say, agnosticism does not logically lead to atheism.
One horn of agnosticism is the belief that we can’t know if God exists. Since an atheist cannot prove that God does not exist, the agnostic has no substantiation for turning to atheism as a worldview. We actually can know if God exists through His revelation. Without being able to prove that God does not exist and given the possibility of God’s revelation, the agnostic should not turn to atheism. In fact, the agnostic should not even remain agnostic for these reasons.
Furthermore, agnosticism can be the belief that we can know God’s existence but don’t have the quantity or quality of information at this time to support the belief that He has revealed Himself to us. Where this horn of agnosticism fails is that the assertion can’t be substantiated. What test is there that can be applied to know for sure that we don’t have the appropriate information or proof? There is no template or methodology for this sort of thing. Alternatively, we can know that God has revealed Himself to us through God’s revelation itself. Whether or not everyone agrees that God has done so is irrelevant. Stating we don’t have evidence of God’s revelation is something that can’t be proven. It would require all possible knowledge of this existence and the ability to disprove the phenomenon that people experience revelations. Even this tine of the agnostic fork doesn’t logically lead to atheism.