Every believer at the moment of belief has returned to God with intent, i.e. has repented.
Once He then bestows eternal life, even He is unable to remove it through faith in Christ.
You remove yourself from faith in Christ once you murder, commit adultery, etc., and are unrepentant. If you then die, does God say, "well, he would have repented eventually, so I will hold him close to me in the next life" ?
No.
(Actually, God does know what you would have done, although He does not interfere with free will. That is a Mystery.)