Always bring your lesson back to the person and covenantal work of Christ. Put the particular doctrine into the big picture. Always bring it back to the covenant between the Father and Son (and the role of the Spirit). The 5 points are irrefutable if you focus on Christ being sent by the Father as a federal head and mediator for those "the Father gave him." Election, Justification, Sanctification, perserverance, etc. all make much more sense, especially when grounded in the common truths even Arminians take for granted, like the Trinity and substitutionary work of Christ.