This is a complicated question, and so will receive a complicated answer! God being God, He’s not really in the religion business. God didn’t make religion, God made all of Creation. Religion is a human construct to try to understand God. So, God doesn’t necessarily condemn religions, per se. God condemns sin and the injustice that it causes to the creation God made. Some religions (like burning children alive as a sacrifice to Molech, for example) make sin worse, some don’t. The “proper” religion can make sin worse when abused, as well. That doesn’t make all religions equal, or that somehow all religions are merely different parts of the same proverbial elephant (if you’ve heard that analogy).
Religions make claims that exclude other religions. What Christianity does, along with Judaism and Islam to some extent, is recognize God as He’s revealed Himself through the history of the people of Israel which was later recorded in the Scriptures (Islam sees Muhammad as the last of the prophets and the Qur’an as the ultimate revelation, which Christianity and Judaism reject for different reasons). Christianity stands apart because it recognizes the ultimate revelation of the one and only God through Jesus the Christ. God destroys the power of sin and death (which was instituted so we couldn’t live forever AND sin – how awful that would be!) through Christ Jesus’ death on the cross and resurrection. This destruction of the power of sin and death, this amazing grace and forgiveness, happened for all people (2 Cor 5:14-15). That being said, it doesn’t get more exclusive than Jesus saying, “I am the way, the truth, and the life. No one comes to the Father except through me.” (John 14:6).
The exclusivity works like this, you either live in the truth of God’s love and forgiveness through Jesus’ sacrifice or you don’t. God doesn’t necessarily punish those for following a different religion. The instances in the New Testament that talk about God condemning non-Christians (ex. 2 Thessalonians 1:3-10) have more to do with condemning their violent persecution of Christians and embracing of the evil that is the utter rejection of God’s love, not because they might be followers of the Greek or Roman gods or Jews that didn’t recognize Jesus as the Messiah or something like that. It doesn’t appear to me in Scripture that God punishes those of other faiths simply for being “wrong.”
Simply put, there is no other truth than Christ Jesus. Following something else may bring about understandings of the truth, but will never fully embrace the truth which is Christ Jesus. For those of other faiths (or lack of faith), we entrust them to God’s grace throughout this life and the next. But to truly get the most out of this life, to best understand this life and the next, to truly be set free by the truth is to follow the way, the truth, and the life, Jesus the Christ. Since we follow Christ, our job is not to condemn other religions, but to share with them our love that we have through God the Son, with whom we are well pleased.
Like I said, this is a complicated question. This answer isn’t definitive nor does it sum everything up, but I think it’s a healthy base for further discussion, which I am always happy to have with you.