God hides truth from the world to a certain extent, for how would anybody come to the truth if He hides truth from the world when we are all part of the world at one time, and some stay in the world.
Creation testifies that there is a God and of His attributes, which one of them is love, for He provided food, and the means to make clothing and shelter, so the world is without excuse if they do not follow the 2 greatest laws, love God, and love people, which is how the people that never heard the word of God will be judged after the millennial reign of Christ.
Jesus came to the Jews and spoke the truth to them, and those that believed in Jesus the Spirit would reveal the truth to them.
We have the word of God that anybody from the world can read if they want, which the truth is there, and prophesy testifying that He is the true God, for He told us the end from the beginning, and some things of the Bible can be understood without the Spirit, for it does not take the Spirit to understand thou shalt not steal, and David was king in Israel.
Saints doing miracles, and their lives changed for the better is also a testimony.
The truth is there and we were all part of the world at one time, but nobody can come all the way to the truth unless God intervenes in their lives, for if not the flesh will prohibit them from the truth, or coming all the way to the truth.
Many are called, but few are chosen, so God calls people and works with them if their heart condition is right, and not many noble, not many mighty according to the flesh, not many wise in the world, are called.
No person says Jesus is the Lord, but by the Holy Ghost.
No person comes to the Son unless the Father draws them.
Peter confessed Jesus as the Christ, the Son of the living God, which flesh and blood did not reveal that to Him but the Father.
Concerning the end time none of the wicked shall understand, but the wise shall understand.
If you are part of those that know and claim these things then God for sure is working in your life, and it cannot be another way, which I will point out that many who do not believe OSAS if you do not abstain from sins doing the works of God by the Spirit that confess these things, and understand the end time, so God has to be working in their life, so if OSAS is true then they would be saved even if they do not believe OSAS for it would have no bearing on them being lost, for God would only work in the lives of those He chose.
The truth is there, but many do not see it because the flesh rules them too much, which God said the wisdom of this world is foolishness to Him.