Whenever God begins something, we have the assurance that He will finish it. Nothing will stand in the way of Him accomplishing His purpose in this world and in our lives. What God starts, He finishes, and nobody can hinder Him. Sure, delays will happen. Just remember, God is in charge of the delays as well as the progress.
The clash between science and religion has not shown that religion is false and science is true. It has shown that all systems of definition are relative to various purposes, and that none of them actually “grasp” reality.
If a religion is not universal, it cannot be eternal. A narrow religion, a sectarian religion, an exclusive religion can live only for a limited time and a limited purpose.