I like Jesus’ explication on this theme:
"By their fruits you shall know them. Do men gather grapes of thorns, or figs of thistles? " - Matthew 7:16
and Paul continues with this line of thought:
“But the fruit of the Spirit is, charity, joy, peace, patience, benignity, goodness, longanimity, mildness, faith, modesty, continency, chastity. Against such there is no law.” - Galatians 5:22-23
In the realm of religion, the truth and falsehood of beliefs are known through their fruits, as the Lord Christ explained to us. If a religion believes in a flying purple cow, but leads its followers to love, generosity, the strengthening of family, the abandonment of racial and religious family, the acquisition of knowledge and the upraising of character, then that religion is, in truth, leading people to God and to spiritual life.
My own personal approach which I have come to over time is that I will never try to undermine anyone’s religious identity.