In the PCA, one does not need to be a member of a certain church in order to partake of communion there. Rather, anyone who is a believer in Christ can partake, even if their membership is in some other evangelical church. This is reflected in the words of explanation given as the elements of the Lord’s Supper are being distributed at our church.
What if you’re struggling in your faith? Well, in that case it’s even more important to partake. We need to feed on Christ most when we are weak. So, when you’re struggling, cry out to Him, repent of any sin in your struggle, and take the body and blood of the Lord.