Isn't it unkind to criticise another church?
It would be unkind to mock people. It is not unkind to ask whether a teaching is true, gently and with evidence, when eternity is at stake.
Latter-day Saint missionaries knock on doors because they believe their message matters. We take the same view of the gospel of the Bible. Peter tells Christians to give a reason for their hope with gentleness and respect, and Paul says to speak the truth in love. If anything on this site falls short of that, please tell us through the contact form.
15But sanctify the Lord God in your hearts. Always be ready to give an answer to everyone who asks you a reason concerning the hope that is in you, with humility and fear,
1 Peter 3:15 (WEB) · context
15but speaking truth in love, we may grow up in all things into him who is the head, Christ,
Ephesians 4:15 (WEB) · context
24The Lord’s servant must not quarrel, but be gentle toward all, able to teach, patient, 25in gentleness correcting those who oppose him. Perhaps God may give them repentance leading to a full knowledge of the truth,
2 Timothy 2:24-25 (WEB) · context