“Is there a way to recognize another Christian?”
The answer is YES!!!
Two ways that you should be able to identify another Christian:
1) Through their Love and Concern for others
John 13:35 Amplified Bible (AMP)
35 By this everyone will know that you are My disciples, if you have love and unselfish concern for one another.”
2) Through their Fruits [Acts/Actions]
Matthew 7:15-17 Amplified Bible (AMP)
15 “Beware of the false prophets, [teachers] who come to you dressed as sheep [appearing gentle and innocent], but inwardly are ravenous wolves. 16 By their fruit you will recognize them [that is, by their contrived doctrine and self-focus]. Do people pick grapes from thorn bushes or figs from thistles? 17 Even so, every healthy tree bears good fruit, but the unhealthy tree bears bad fruit.
In essence you should be able to recognize another Christian through their Christian walk and the love that they have for one another.
God Bless you all.
Have a great week!