It's extreme arrogance on your part to assume there is only two choices.
The other possibilities are you pick the wrong God(s).
Suppose Mithra is the real God and he's really pissed at you Christians for copying much of his Religion then it's you who are really screwed. Or Zeus, Durga, Allah, etc. are the real God(s) then you wasted your life and lose everything.....for eternity.
My confidence is in the Creator of the universe who spoke to us through Scripture......in God alone, and His revelation to us of His love, and provision of redemption for our sins (from the day of Adam), through His Son, Jesus.
Christianity is unique to any other religion or philosophy, before or since, despite any similarities we might see, because of the person of Jesus Christ, who became man, but was the exact representation of God's being, one with the Father, and who allowed Himself to be sacrificed to pay the penalty for our sin, but conquered death through His bodily resurrection, and physical ascension into heaven.
All other religions are human attempts to reach God. Only through Christ, did God reach down to US, and offer Himself for our salvation.
It is not arrogance for me to say these things. It is the knowledge that I am completely unworthy of His love, a sinner saved by the grace of God, and unashamed of what He, in His mercy, has done for me.