"TELL the TRUTH" Proclaim the TRUTH --- JESUS !
if you try to expose catholicism, universalism, republicanism, almost any -ism, you will fail. they aren't drawn to their favorite sacred cow being exposed.
Instead tell the Truth , the Good News, talk about JESUS and what HE DID for you. THAT is what the disciples did. When people realized that because of their sinful lives, JESUS DIED a HORRIBLE DEATH as a CRIMINAL hung on a living tree,
then they have a choice -
repent, or reject Him.
but the arguments 'exposing' all the various lies of chrislam, buddya, confusionism, etc etc etc is very very minor --- oh, it gets done, but not by 'discussing' it (as if debating whether it is true or not).
the truth sets people free, IF they know it. talking about all the other false religions doesn't help them to know the truth. even 'christians' who don't know the truth are in trouble - not with other religions, but in themselves with Yhwh - so the truth is critical, life-saving, and required even for christians. (like paul said - it is a safeguard to keep repeating the truth, even though you know it, to be sure that no one is (again) deceived by sin etc etc etc)