Being an active member of the church can allow me to have experiences in which I come to know and have a testimony of and faith in my Savior and His healing power to redeem me, but it isn't my activity that does that. I can be actively engaged and still not actually have faith in and rely on His saving grace.
My involvement in my religion is just a means to that end, which is what I believe is meant by "enduring to the end." It is my relationship, faith, and trust in Him which allows His atoning sacrifice to redeem me.
I am grateful that each week I can go and worship and be reminded of His ultimate sacrifice on my behalf. I am grateful that I have scriptures which testify of Him and help me feel His love and increase my desire to serve Him. It isn't even my service that will save me. It is just a way to feel closer to Him as I love the people He loves and as I do what He wants me to do. My works only increase my love and dependence on Him and helps me feel His presence.