It is undeniable that there are divisions within the church and it is quite right that the behaviour of certain 'churches' is questioned because I believe the overriding message of Christ is one of love, specifically.
Mark 12:28-32 says,
"28 And one of the scribes came, and having heard them reasoning together, and perceiving that he had answered them well, asked him, Which is the first commandment of all?
29 And Jesus answered him, The first of all the commandments is, Hear, O Israel; The Lord our God is one Lord:
30 And thou shalt love the Lord thy God with all thy heart, and with all thy soul, and with all thy mind, and with all thy strength: this is the first commandment.
31 And the second is like, namely this, Thou shalt love thy neighbour as thyself. There is none other commandment greater than these.
32 And the scribe said unto him, Well, Master, thou hast said the truth: for there is one God; and there is none other but he:" (KJV)
1 Corinthians 13, again, stresses the importance of love,
"13 If I speak in the tongues[a] of men or of angels, but do not have love, I am only a resounding gong or a clanging cymbal. 2 If I have the gift of prophecy and can fathom all mysteries and all knowledge, and if I have a faith that can move mountains, but do not have love, I am nothing. 3 If I give all I possess to the poor and give over my body to hardship that I may boast,[b] but do not have love, I gain nothing.
4 Love is patient, love is kind. It does not envy, it does not boast, it is not proud. 5 It does not dishonor others, it is not self-seeking, it is not easily angered, it keeps no record of wrongs. 6 Love does not delight in evil but rejoices with the truth. 7 It always protects, always trusts, always hopes, always perseveres." (NIV)
Tbh the importance of love is stressed again and gain, through Christ, in the New Testament and Christians are supposed to believe in Him and follow Him, do His works.
However church unity is also sought Ephesians 4 says,
"Unity and Maturity in the Body of Christ
4 As a prisoner for the Lord, then, I urge you to live a life worthy of the calling you have received. 2 Be completely humble and gentle; be patient, bearing with one another in love. 3 Make every effort to keep the unity of the Spirit through the bond of peace. 4 There is one body and one Spirit, just as you were called to one hope when you were called; 5 one Lord, one faith, one baptism; 6 one God and Father of all, who is over all and through all and in all." (NIV)
So the Christian church certainly is not perfect or completely unified, but, IMO, that does not mean we should just give up, rather we should seek to improve by becoming more Christ like and more loving.