Yes. Unfortunately, all other religions, while they may express some truths, are not the Truth. Christ says “I am the Truth.” He is making a truth claim here. This is not arrogance, it is a statement of fact. In the same way that saying 2+2=4 is not arrogant, discriminatory or elite, making a truth claim about religion is not arrogant. The nature of a truth claim is that it is exclusive. Other religions can be close to the truth, but they are not the truth. Religion is the deep human search for existential meaning, and all religions since the dawn of man are really searching for Christ. Orthodoxy Christianity is the fullness of what Christ taught, without change. Nothing added, subtracted or modified.
But we also know that where there is love, there is Christ.
As St Paul says, Christians might have all knowledge and truth, but with no love, it is pointless.
You could be born a Hindu or a Muslim, a Jehovah’s Witness or an Atheist - if you have love, you really have Christ. All will be resurrected by Christ - every Jew, Agnostic, Buddhist, Sikh, you name it.
The will of Christ is written intuitively on every man’s heart. Love. Being an Orthodox Christian does not mean you have some golden ticket. It simply means having truth and therefore peace. But you could be the most devout Orthodox monk, saying all the prayers, chanting all the chants, doing all the services and wearing all the vestments - but if you have no love? What then?
Love is Christ. If you have love, you are Christian without even knowing.