Question 1: Is there anything that could block us from seeing visions of God?
The answer is yes.
The Bible gives us a hint as to what blocks us from seeing Him. God shuts the eyes of those who stubbornly harden their hearts towards Him and neglect to obey His Word. Because of our sins, God hides His face from us.
Romans 11:7-8,11 NLT So this is the situation: Most of the people of Israel have not found the favor of God they are looking for so earnestly. A few have—the ones God has chosen—but the hearts of the rest were hardened. As the Scriptures say, “God has put them into a deep sleep. To this day he has shut their eyes so they do not see, and closed their ears so they do not hear.” Did God’s people stumble and fall beyond recovery? Of course not! They were disobedient…
Isaiah 59:2 ESV but your iniquities have made a separation between you and your God, and your sins have hidden his face from you so that he does not hear.
As we fall deeper and deeper into darkness as we sin, we give Satan the chance to “blind our minds.” Satan does not have the right to prevent us from seeing God. It is only our disobedience that gives him that license to.
2 Corinthians 4:4 ESV In their case the god of this world has blinded the minds of the unbelievers, to keep them from seeing the light of the gospel of the glory of Christ, who is the image of God.
Acts 26:18 ESV to open their eyes, so that they may turn from darkness to light and from the power of Satan to God, that they may receive forgiveness of sins and a place among those who are sanctified by faith in me.’
Isaiah 43:8 ESV Bring out the people who are blind, yet have eyes, who are deaf, yet have ears!