If the dispensationalist will simply answer these honestly presented queries, we will be able to discern whether the accusations against dispensationalism are true -
1. Has the OT saint partaken of the blood of Christ shed for sins?
Then Jesus said to them, "Most assuredly, I say to you, unless you eat the flesh of the Son of Man and drink His blood, you have no life in you. Whoever eats My flesh and drinks My blood has eternal life, and I will raise him up at the last day."
And as they were eating, Jesus took bread, blessed and broke it, and gave it to the disciples and said, "Take, eat; this is My body." Then He took the cup, and gave thanks, and gave it to them, saying, "Drink from it, all of you. For this is My blood of the new covenant, which is shed for many for the remission of sins."
2. Does the Spirit of Christ dwell in the OT saint?
"He who eats My flesh and drinks My blood abides in Me, and I in him."
But you are not in the flesh but in the Spirit, if indeed the Spirit of God dwells in you. Now if anyone does not have the Spirit of Christ, he is not His.
3. Are ALL the saints of ALL the ages ONE BODY, drinking of the SAME Spirit?
The cup of blessing which we bless, is it not the communion of the blood of Christ? The bread which we break, is it not the communion of the body of Christ? For we, though many, are one bread and one body; for we all partake of that one bread.
1 Corinthians 10:16-17
For by one Spirit we were all baptized into one body-- whether Jews or Greeks, whether slaves or free--and have all been made to drink into one Spirit.
1 Corinthians 12:13
If one answers in the affirmative the above queries, one has abandoned Dispensationalism. Congratulations, brother, welcome to orthodox Christianity! If one answers any of the above in the negative, then the accusations against dispensationalism are true, and we would ask that person to produce the means of the OT saints salvation!
Soli Deo Gloria !