Unity according to Apostle Paul:
10 Now I beseech you, brethren, by the name of our Lord Jesus Christ, that ye all speak the same thing, and that there be no divisions among you; but that ye be perfectly joined together in the same mind and in the same judgment. 1 Cor. 1:10
This is the unity Paul believed in. He wrote that by one spirit we are all baptized into one body and all made to drink into one spirit. So there is s spiritual unity between all spirit baptized people.
Yet Paul urges them to believe and speak the same thing.