I personally would say yes. The purpose of the gospel is making it explicit, proclaiming unequivocally to all who have not heard - "You're sins are forgiven through Christ, as attested by the Apostles through miracles, etc", so that all who have faith may believe.
But this does not rule out certain individuals who already have faith in the true God, in spite of perhaps being in a setting wherein the official religion of their culture is essentially demonic, being somehow able to sift through all that and follow through faith the true God, as evidenced by a life of righteousness, love, etc.
The verses that seem to me to speak to this matter are the following.
(John 14:19-23) "After a little while the world will no longer see Me, but you see Me; because I live, you will live also. In that day you will know that I am in My Father, and you in Me, and I in you. He who has My commandments and keeps them is the one who loves Me; and he who loves Me will be loved by My Father, and I will love him and will disclose Myself to him." Judas (not Iscariot) *said to Him, "Lord, what then has happened that You are going to disclose Yourself to us and not to the world?" Jesus answered and said to him, "If anyone loves Me, he will keep My word; and My Father will love him, and We will come to him and make Our abode with him.
(Rom 2:14-16) For when Gentiles who do not have the Law do instinctively the things of the Law, these, not having the Law, are a law to themselves, in that they show the work of the Law written in their hearts, their conscience bearing witness and their thoughts alternately accusing or else defending them, on the day when, according to my gospel, God will judge the secrets of men through Christ Jesus.
I could be wrong, honestly, regarding at least the Romans passage above, which may not be implying that people who have never heard the gospel can be saved, but it sounds that way.