So Buddhist can worship Christ and call themselves Christians and can define him however they want...
You are correct, he is there for all to follow, but you have to follow him, not follow whomever you want to and call that Christ...
Does a person's believes about Christ have to be 100% accurate for them to be a Christian? If 95% of what they believe is true and 5% false, are they still a Christian and are they still saved? 90%/10%? Where's the cut-off?
In the end, who gets to make the judgement call on if someone is following the "true" Christ?