Religious is just a word that people use to say they believe in something. I prefer not using “religious” because anyone can be religious. Someone can be religious to mormonism. Others can be religious to satanism. It doesn’t describe what you put your beliefs in. Instead of saying “believer”, I prefer to categorize people into one of two categories: follower of Christ or not. Even saying someone is Christian has lost its meaning in today’s world. Someone can say they’re Christian because they grew up in a Christian family but have no relationship with Jesus at all. If you truly believe in Jesus, you follow after Jesus because the ultimate goal is to love God and we show love to God by being faithful disciples, sharing the Word, and bearing fruit which only happens with true believers. Ultimately, God is the only one that judges everyone because He knows our heart and our motives. If someone claims to be a Christian yet perpetually commits sins, it is not unloving to call them out and encourage change. It is loving to do this because sin draws us away from God and we want everyone to grow closer to God. Sometimes you hear all too often, “Only God can judge me.” Yes, God is the only one to judge your heart and motives, but if you call yourself a Christian, other Christians have the right to call out a brother or sister if he/she is stumbling and sinning continuously. It even goes to the extent that if they do not wish to turn away from their sins, we are to have nothing to do with this person (1 Corinthians 5). Hope this answers your question!