I'm a Christians, so obviously I believe in the Abrahamic God, and his son, the savior Jesus Christ. But without knowing more about you, it would be impossible for me to have any idea about whether or not you were hellbound. Not all Buddhists worship idols, although it is conceivable that many do.
1) Do you worship or revere the Buddha as a "god", or do you just view him as an inspirational teacher of a philosophy that you believe in? If you worship him as a god, then you are worshiping a false idol. If not, then the way you practice Buddhism isn't necessarily comparably to idolatry.
2) Buddha never specifically endorsed a belief in Jesus Christ as the messiah, however that doesn't mean that all proponents of his philosophy have rejected such teachings. I don't believe that Buddhism and Christianity are mutually exclusive (in the way that most other religions are). One can in fact be Christian and Buddhist at the same time (although admittedly most are not). So, do you as a Buddhist accept Jesus Christ as your Lord and savior, do you reject him outright, or are you agnostic about him?
3) Even people who commit sin out of ignorance, or those who have never come to know Jesus Christ aren't necessarily hell bound. As a Christian, I believe that every righteous person will have the opportunity to come to know Christ and live in God's heavenly kingdom. The bible says that the Lord judges in righteousness and people are ultimately held accountable to what they know, rather than what they don't know. People will be judged according to their deeds.
4) Being a sinner doesn't automatically make someone hell bound. Being an unrepentant who rejects the savior is what makes someone hell bound. The only nonredeemable sin (according to the bible) is blasphemy against the Holy Spirit. So, have you ever cursed the Holy Spirit? If not, then you're not hell bound until you reject the salvation of Christ.