Are religions all different roads leading to the one God?

For those people who believe there is a god then, yes, they probably do. Hinduism's Rig Veda says, "By whatever name you call me, it is I who will answer."

If we must believe in God in the 21st century, surely we could believe in one who is big enough to encompass all people and all religions. The time for tribal gods (like the YHWH of Abraham) is long past.

If you're a Hindu, yes, If you're of one of the Abrahamic religions no.

No, I don't feel that they are at all.

It is more likely there is many perspectives all stemming from a similiar type of indoctrination.

The apostle Paul received instructions from the resurrected Jesus Christ that said quite the contrary. Jesus sent him to people of the nations “to open their eyes, to turn them from darkness to light and from the authority of Satan to God.” (Acts 26:17, 18) Clearly, our choice of religion does matter. Many of the people to whom Paul was sent already had a religion. But they were in “darkness.” Indeed, if all religions were simply different roads leading to life everlasting and God’s favor, there would have been no need for Jesus to train his followers for the disciple-making work that he commissioned them to do.—Matthew 28:19, 20.

In his famous Sermon on the Mount, Jesus said: “Go in through the narrow gate; because broad and spacious is the road leading off into destruction, and many are the ones going in through it; whereas narrow is the gate and cramped the road leading off into life, and few are the ones finding it.” (Matthew 7:13, 14) The Bible explicitly states that there is “one faith.” (Ephesians 4:5) Clearly, many who are on the “broad” road have a religion. But they do not have the “one faith.” Since there is only one true form of worship, those who desire to find that true faith will have to seek it out.