Personally, I don't call anyone from other religions a liar.. they are very sincere in what they believe. Just as we Christians are.
The bible says something else though which might shed more light on this discussion....
"at that time, (talking of the end times), many will turn away from the faith and will betray and hate each other, and many false prophets will appear and deceive many people. Matthew 24:10 -11
"For false prophets and false christs will appear and perform signs and miracles to deceive the elect - if it were possible" Mark 13:22
Yes all the epistles of John speak of the antichrist and the lies of people who deny the Lord ship of Christ... but it's the religion they profess to believe in that is the problem, not the people themselves. .. as we discuss these issues together, let's keep in mind that Jesus died for ALL people and that Satan appears as an angel of light..his purpose.. to keep people from turning to Jesus as the only Way to God.
I know this might seem a controversial subject, but it's possible for anyone, even Christians to be sincerely deluded. (hence Jesus's warning.. that not everything you see, even signs and wonders is necessarily of God)
Your thoughts?
Carol