Not all OPs have a bad spirit. They don't all have a good spirit, either. Same can be said for the AG, Baptists, Catholics, Hindus, atheists, etc. People are people. We all have our faults, and our good qualities.
And lots of people "love one another". When you see a group of folks who love each other, according to Jesus, you can assume they are His disciples. If you take Jesus at His word, you could reach this conclusion before you even know what their doctrines are, or whether they even call themselves followers of Christ. Could it be that some people follow His teachings, without even knowing it?
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Hebrews 13:23 Know ye that our brother Timothy is set at liberty