Will the mark of the beast be a tatoo? I worry that there is an extent where a tatoo can be a bad thing. Sins, haircuts, beard styles can all be remedied. But tatoos remain and are difficult to remove.
I dislike tattoos, although there is no prohibition against them in the New Testament - there was in the Old Testament.
[Rom 8:37-39 ESV] 37 No, in all these things we are more than conquerors through him who loved us. 38 For I am sure that neither death nor life, nor angels nor rulers, nor things present nor things to come, nor powers, 39 nor height nor depth, nor
anything else in all creation, will be able to separate us from the love of God in Christ Jesus our Lord.
As you well know, the letter to the Romans was written to the believers in Rome. They were pronounced "conquerors through him who loved us". Absolutely nothing can prevent God's elect from spending eternity with Him.
[1Co 15:42-44 ESV] 42 So is it with the resurrection of the dead. What is sown is perishable; what is raised is imperishable. 43
It is sown in dishonor; it is raised in glory. It is sown in weakness; it is raised in power. 44 It is sown a natural body; it is raised a spiritual body. If there is a natural body, there is also a spiritual body.
The body that our soul now occupies while not be the body that accompanies our soul to heaven, whether we die and are resurrected or we are raptured to join the Lord in the air.