Heaven is such that all who have lived well, of whatever religion, have a place there. — Emanuel Swedenborg. Swedish scientist, philosopher, and theologian (1688–1772)
You are not made happy by the true things you believe from your faith, but by the goodness which comes from your faith.
True wisdom is seeing what is beneficial to your eternal life, and managing your life according to that. You do this when you not only know these things and grasp them with your understanding, but also will and do them.
Real joy, which comes from loving to do good things without wanting to be repaid, is the reward that lasts forever.