Some believe grace is not really a gift but gives man an opportunity to believe or not, but this scenario is about as likely as believing that shining a light into the eyes of a blind man will enable him to see if he wants to. If the blind is not given new eyes, he will not see. And once he is given new eyes he already sees. Grace is grace because Jesus gives to us what we were unable to give to ourselves: eyes to see, ears to hear, and a heart to believe. (Deut 29:4; 30:6)
Some teach that 'salvation depends on human will', but the Bible teaches (and I quote) 'it depends not on human will or exertion, but on God, who has mercy." (Rom 9:16)
We cannot believe in just any "Jesus", and think that because we are using this word, that we are, therefore, honoring God. The Jesus of the Bible is one who saves by grace ALONE, not the false or inconsistent Jesus' proclaimed by many who want to partly retain the merit, wisdom or humility of man. It is only when man is stripped of all hope in himself and, by grace, turns to Jesus alone that he understands the gospel. Do you trust in Jesus alone? If you do then know this, Jesus provides EVERYTHING we need for salvation, including the Holy Spirit to believe (John 6:63, 65), the wisdom and sound judgment to believe (1 Cor 1:30) and a new heart to believe (Ezek 36:26). Jesus is sufficient.
"But to this day the LORD has not given you a heart to understand or eyes to see or ears to hear." - Deut 29:4.