There are two issues here:
1) If you don't follow the Bible then you aren't Christian
2) If you follow the Bible then it is necessary to believe that homosexuality is wrong
So, what do you think?
To be Christian is to accept Christ as Lord and to follow his example.
Some people will claim that being Christian means to follow the bible, but
NO ONE follows everything in the bible. By that definition, there would be no such thing as a Christian. Besides, what is more important, the book or the Lord?? Why don't you call yourself a Biblian if you hold the book over Christ?
To be Christian is to accept Christ as Lord and to follow his example.
Jesus did not once utter anything about homosexuality. Not once. Jesus walked with those who were shunned by society and drew them into the circle of God's love. Jesus said "love thy neighbor" and "judge not lest you be judged."
I don't know whether Jesus thought that homosexuality is a sin; he didn't say one way or the other. I do know that, as we are
all sinners, it doesn't matter anyway. We are still, all of us, within the circle of God's love.