What's important is seeking the truth and being honest with oneself, as well as being good. If that leads you to disbelief in God, that's fine. If it leads you to belief in Islam, that's fine. If it leads you to believe in Christianity that's fine as well. If it leads a person to belief in God, that's fine as well. Whatever religion or path a person finds being honest with themselves, I will respect them from it.
Not all people sincerely searching the truth find it.
Not all people sincerely searching the truth find it.