I see the fruit of Christianity as mirroring Christ. Men like Phelp's, Barrel and his group don't mirror Christ and their fruit is discord and dissention.
John 15:8
[Bear much fruit] Are fruitful in good works; are faithful, zealous, humble, devoted, always abounding in the work of the Lord. This honors God.
1. Because it shows the excellence of his law which requires it.
2. Because it shows the power of his gospel, and of that grace which can overcome the evil propensities of the heart and produce it.
3. Because the Christian is restored to the divine image, and it shows how excellent is the character after which they are formed. They imitate God, and the world sees that the whole tendency of the divine administration and character is to make man holy; to produce in us that which is lovely, and true, and honest, and of good report. Compare Matt 7:20; Phil 4:8.
(from Barnes' Notes, Electronic Database. Copyright (c) 1997 by Biblesoft)
John 15:8
That ye bear much fruit. As His whole design in providing "the True Vine," and making men lives branches in Him, was to obtain fruit; and as He purgeth every branch that beareth fruit, that it may bring forth more fruit; so herein is He glorified, that we bear much fruit. As the farmer feels that his pains are richly rewarded when the fruit of his vineyard is abundant, so the eternal designs of Grace are seen to come to glorious effect when the vessels of mercy, the redeemed of the Lord, abound in the fruits of righteousness, which are by Jesus Christ unto the glory and praise of God, and then the Father of our Lord Jesus Christ "rests in His love and joys over them with singing."
(from Jamieson, Fausset, and Brown Commentary, Electronic Database. Copyright (c) 1997 by Biblesoft)
John 15:1-8
1. We must be fruitful. From a vine we look for grapes (Isa 5:2), and from a Christian we look for Christianity; this is the fruit, a Christian temper and disposition, a Christian life and conversation, Christian devotions and Christian designs. We must honour God, and do good, and exemplify the purity and power of the religion we profess; and this is bearing fruit. The disciples here must be fruitful, as Christians, in all the fruits of righteousness, and as apostles, in diffusing the savour of the knowledge of Christ.
(from Matthew Henry's Commentary on the Whole Bible: New Modern Edition, Electronic Database. Copyright (c) 1991 by Hendrickson Publishers, Inc.)
The manner in which we bear fruit would depend on what gifts of the Spirit we possess.