Being indiscriminately “welcoming” without care for the integrity of the faith is condemned in Scripture.
2 John 10 If any one comes to you and does not bring this doctrine, do not receive him into the house or give him any greeting; 11 for he who greets him shares his wicked work.
Welcoming the penitent, for example, is a good thing. Calling all to penitence is a good thing. Providing charity to all is a good thing–both the needs of the spirit and the needs of the body. Welcoming the performance of superstitious ritual is not. Nor is welcoming non-Christian errors, as if they were compatible, complementary, or supplementary with Christian truth, or that those who promote them are a source of revelation, which ended with the death of the last Apostle.
2 Cor. 6:14 Do not be mismated with unbelievers. For what partnership have righteousness and iniquity? Or what fellowship has light with darkness? 15 What accord has Christ with Be′lial?[a] Or what has a believer in common with an unbeliever? 16 What agreement has the temple of God with idols? For we are the temple of the living God; as God said,
“I will live in them and move among them,
and I will be their God,
and they shall be my people.
17 Therefore come out from them,
and be separate from them, says the Lord,
and touch nothing unclean;
then I will welcome you,
18 and I will be a father to you,
and you shall be my sons and daughters,
says the Lord Almighty.”
To sum it all up:
Bl. Pius IX, Quanto Conficiamur Moerore
- God forbid that the children of the Catholic Church should even in any way be unfriendly to those who are not at all united to us by the same bonds of faith and love. On the contrary, let them be eager always to attend to their needs with all the kind services of Christian charity, whether they are poor or sick or suffering any other kind of visitation. First of all, let them rescue them from the darkness of the errors into which they have unhappily fallen and strive to guide them back to Catholic truth and to their most loving Mother who is ever holding out her maternal arms to receive them lovingly back into her fold. Thus, firmly founded in faith, hope, and charity and fruitful in every good work, they will gain eternal salvation.