Are you unaware of Jesus' words in Matt.7:8?
It is written..."For every one that asketh receiveth; and he that seeketh findeth; and to him that knocketh it shall be opened."
Again, I knocked and He answered.
Unbelievers have had their minds blinded by the devil.
I am proof that some can break those bonds.
Our God is way more powerful than the god of this world.
Regarding Matt 7:8, I believe the context of the adjacent verses (and hence, that verse too) pertains to the children of God (to include a son). To be a child of God, one must be of the elect; that is, has already been chosen of God to salvation. Consequently, I do not perceive verse 7:8, to be about becoming saved, but rather, is referring to a child of God's desire for spiritual wisdom and knowledge I.E, "seeking", "knocking", "finding", ETC., but not in "becoming".
Regarding your second point, I am not entirely sure how to reply to its first part since I can't comment or judge someone else's salvation; however, for the second, I would definitely agree and say that He manifested that power in Jesus Christ, and made it known in/by His gospel and its doctrine. But, that power is NEVER used by Him in such a way so as to turn it contrary to His own doctrines.