Such alienation is not intentional on our part, but it is inevitable. This is so because of the mystery of freedom. Some people have alienated themselves from the truth about abortion. If, then, we faithfully expose that truth, they may choose to alienate themselves from us, too. If we never speak of the issue, we may cover over the division for a while, but that is not the same thing as unity.
Unity is founded on truth, and is fostered by a clear exposition of truth.
We do not build unity by our own human plans, efforts, and programs. We build it by lifting up Christ for all to see and hear. We build it by proclaiming His Word, without ambiguity or apology. Sure, there will be some division for the same reason that there will be some alienation. But the Word itself causes that.