If all religions were the same, and they all led to the same place eventually, then you’d be right — there wouldn’t be any point in sending out missionaries. But all religions aren’t the same, as even a superficial study will show.
Some believe in one god; others believe in thousands of deities. Some believe in a strict moral code; others encourage all kinds of immoral behavior. Some believe in life after death; others don’t. Some urge their followers to love even their enemies, while others instill hate and violence. They can’t all be right, can they?
But the Bible gives us a startling message: In spite of our sin and rebellion, God still loves us, and he has proven it by coming down to earth in the person of his son, Jesus Christ. Jesus came so our sins could be forgiven and we could be reconciled to God, and he made this possible by dying on the cross for our sins.
Because of this, only Jesus could say, “I am the way and the truth and the life. No one comes to the Father except through me” (John 14:6).
My prayer is that you will see your own need for God’s forgiveness, and by faith turn to Christ and commit your life to him. Once you come to Christ and experience the joy of his presence, you'll want to tell others about God’s love for them — both those around you, and those in the far corners of the earth.