"If man has the mind as you claim to choose Jesus why don't all choose Jesus?
They would, if they knew the truth. Why do people leave Christianity? Same reason."
If people knew the truth they would choose Jesus. So why don't all know the truth?
Firstly, faith is not the same thing as 'sight.' We have all the proof we need - but it is secondary evidence (testimonies, history, signs and wonders, prophecy, nature, etc.) as well as the general conviction by the Holy Spirit of sin. And humans are very good at finding ways to explain away or ignore secondary evidence!
Just look at the parable of Lazarus and the Rich man. The rich man was sure that if Lazarus went to warn his brothers, they would be awed by the proof of the sign and repent. Yet notice Jesus' conclusion of the tale:
“He answered, ‘Then I beg you, father, send Lazarus to my family, for I have five brothers. Let him warn them, so that they will not also come to this place of torment.’
“Abraham replied, ‘They have Moses and the Prophets; let them listen to them.’
“ ‘No, father Abraham,’ he said, ‘but if someone from the dead goes to them, they will repent.’
“He said to him, ‘If they do not listen to Moses and the Prophets, they will not be convinced even if someone rises from the dead.’ ”
Someone who justifies their sin or tries to explain away the proof in front of them isn't going to be convinced by more or 'better' proof. The pharisees showed this in action (with exceptions like Nicodemus), as when John the Baptist preached repentance, they did not turn. When Jesus raised Lazarus from the dead, they did not repent. When Jesus was resurrected, they still did not believe - and went so far as to spread a cover story that the disciples had taken the body.
What are many of the excuses unbelievers use to not be persuaded by the many proofs available? 'The Bible is a myth' 'The Bible is unscientific' 'It's just a book of moral stories' 'The disciples were lying to gain power' - etc.
Just as there exist 'flat Earthers' today who insist that the Earth is flat and excuse all secondary evidence away as conspiracy theories or falsehoods, availability of the evidence does not guarantee that a human will receive evidence as true.
Scripture gives many reasons that people reject, rather than receive, the message:
Some prefer to do evil. (Jn 8:44, Judges 2:9)
Some fear their evil will be exposed (Jn 3:20.)
Some are stubborn and/or rebellious (Hos 4:16, Jer 5:23, Mk 16:14, Mk 3:5)
Some do not synthesize the message with other facts/evidences they may have seen or heard, and Satan snatches away what they heard so they do not think about its implications (Matt 13:19) Basically, they do not put two and two together and apply the implications of the gospel to their life.
Some simply refuse to hear or see any evidence that might conflict with their preconceived views (Ezek 12:2, Mk 6:11)
Etc.
We can see a picture of this with the idea of trusting authority figures to deliver on a promise if it involved delayed gratification. Put a bunch of kids in a room and give them each a marshmallow or piece of candy. Tell them that there is another marshmallow in their desk - but if they don't eat it, then they will get 5 more when the adults return. Many studies like this have been done. Some children wait patiently - the trust in the adults and proof of the first marshmallow enough for them to know that waiting will bring a greater reward. Yet many children just can't wait - whether they trust more candy is coming or not, they can't resist eating the marshmallow they have access to. (The kids who display the ability to delay gratification also do better in life skills later during follow-up studies.)
In a similar manner, some humans love their sin so much that they will not turn from it, and will find many ways to either excuse away or ignore the evidence of the gospel and ignore the conviction to turn from their sin.