Hi lise
I go on the doors offering Jehovah's kingdom message rarely do I mention false religion usually only if brought up by the householder. Recognising false religion as apposed to God's truth is only a small part of being one of God's people. Paul himself had to deal with this and became very unpopular in the countries were people left their false god's and religions to become Christians and thus not a source of income for their leaders.
Are you still a christian how would you teach Christianity to a hindu? how would you address their belief in god's that are not Jehovah? Would you have the strength to say these are not real but Jehovah is?
I have many a trinitarian tell me I will get condemned because I do not recognise Jesus as almighty God but only as God's son.
Having confidence in your faith being the truth is not condemning other religions but a recognition of yourselves as God's people. false religions condemn themselves by being false. All you can do is offer people a chance to leave them for Jehovah's true kingdom message.
I have taken time myself to look at what religions are on offer and IMO only Jehovah's witnesses are Jehovah's people by word, deed and commitment.