If we're going with a general, they all say the same thing, the general message is the same, then the pathway of the new testament is very clear.
Love God, and your fellow man.
Forgiveness.
Understanding.
Look at your own failing before you judge others.
If we're looking at a more fire and brimstone style preaching, encompassing the [snip] old testament, then you better state your source.
This is indeed true. Paraphrased: 'According to how you judge others you will yourself be judged.' Forgive as often as possible and don't look for fault in others.
But this does not imply becoming an accessory to something that you consider wrong. Also the Bible plainly states that what is wrong is often a matter of conscience, believe it or not.
So whilst we shouldn't mistreat gay people in any way, the baker is still under no obligation to promote homosexuality. If writing "Queerspace" on a cake falls under that category, we shouldn't force any Christian to do so.