You can't escape that. The whole point of Christianity is that you have to accept that Jesus is your saviour. He can't just be someone who said 'a lot of interesting things' if you don't take the next step because Jesus was one of many contemporaries or came after others who said exactly the same interesting things as he did. The rest of your post in reply is curiously agnostic. I can't dispute anything else you say with regards to forgiveness or morality because that's exactly the view that I hold. As I said what Jesus said on issues of morality or simply on the best way in which to conduct yourself are not unique.
What's problematic for me is that Jesus wants more than that. Seneca in his Epistulae Morales says; 'If you want to be loved, love.' and to 'Take care not to harm others, so others won't harm you.' These are universal truths that people have always reached regardless of what belief they hold or don't. Marcus Aurelius says; 'We should not say ‘I am an Athenian’ or ‘I am a Roman’ but ‘I am a citizen of the Universe.'
Jesus says these things too, but he also says 'If a man abide not in me, he is cast forth as a branch, and is withered; and men gather them, and cast them into the fire, and they are burned.' That's not necessary. As you say yourself, if your only reason for being moral is so that you may please authority, it's not real morality.
The problem you see only comes if one takes passages such as John 15:6 in an extremely literal way, which I grant is how fundamentalists tend to do. But if one accepts that Jesus was a living embodiment of the Way, then what such passages indicate is that one needs to follow that Way to achieve salvation. Passages such as Matthew 7:21-23 indicate that Christ did not come seeking homage as if he were but yet another earthly potentate. It is indeed unfortunate that too many so called Christians call Jesus Lord of Lords yet do little to nothing about following the Way he exemplified. Such people may call themselves Christians, yet they do not abide in Christ and they shall be cast forth.