[millefleur]

Your phrase "hate the sin but love the sinner" is not in the Bible. Here's what the Apostle Peter has to say about sinners like homosexuals:

2 Peter 2:12 But these, as natural brute beasts, made to be taken and destroyed, speak evil of the things that they understand not; and shall utterly perish in their own corruption;
2 Peter 2:13 And shall receive the reward of unrighteousness, as they that count it pleasure to riot in the day time. Spots they are and blemishes, sporting themselves with their own deceivings while they feast with you

[Future Snake Eater]

Your phrase "hate the sin but love the sinner" is not in the Bible.

Maybe not, but Jesus' own actions prove that it is central to Christian practice. While I'm nowhere near following that axiom to its necessary Christian extent, I do know that it is what we need to believe and practice.

[Unam Sanctam]

Yes, we are to condemn sinful activity, but sinful activity does not define the entirety of a man. We are also called to love all men in the Bible. The Bible calls us both to condemn sin and to love all men. Therefore, as Christians we have to make distinctions and draw lines. To hate the sinner as well as the sin is just as unChristian as to love the sin and the sinner.