#1...As far as "choices" go, nobody & their "level of intellect" gets the credit/glory for faith in Christ...for that belongs to the Holy Spirit alone: "No one can say that Jesus is Lord except by the Holy Spirit" (apostle Paul, 1 Cor. 12:3)
#2...Sorry, but faulty theologians who've taught about so-called "choices" and "decisions" for Christ really don't have actual verses to hang their theological hats on...they try with the one Revelation passage about behold Jesus stands at the door & knocks & people let Him in...but Jesus was writing to CHRISTIANS there...one of the 7 churches referenced in Revelation...the other verse is from the book of Joshua...also a bit of a reach.
The REALITY is that Jesus treated people as spiritually dead...like in Luke 9 when He told the (spiritually) dead to bury the (physically) dead. Or like in Ephesians 2:1-5 where the apostle Paul twice references people as being spiritually dead.
I mean, c'mon...in reading Lazarus' resurrection in John 11, you don't really think it was requisite for Lazarus to have a certain "level of intellect" to walk out of his grave, do you?
Rather, he found Himself suddenly re-alive, and he simply stumbled out...sorry to bust that "choice" bubble of yours.
Bottom line is we all reject Christ ALL the time, until the Holy Spirit graciously GIVES us the GIFT of faith, which we merely receive, just like ANY kid aged whatever to whatever plays that same "reception" role every Christmas...oh sure, there might be a gift that newborn Johnny won't appreciate til later...may not even "unwrap" it yet...but the gift is already there...initiated by his loving father.
There is no verse in the Bible which directly supports paedobaptism. However, there is no verse which directly refutes it, either.
IMO, anytime that Scripture is silent on a topic, dogmatic positions should not be taken. Having migrated from one position to the other in my own spiritual growth, I can understand how sincere Christians could fall on either side of the argument.
Most of the examples from Scripture are of adult conversions. On that issue, there is no disagreement between paedobaptists and credobaptists.