I just wanted to share some experiences I have had and seeds that were planted.
First of all, the strongest witnesses of Christ in my life were people who lived it. I knew they were Christian and that was enough. At least for the family that God used to shine as a light to me. This family had and still has so much joy and peace, as they have Christ in the center of their lives, that I could never get it out of my head. I never found it elsewhere in the world. They literally resonate an otherworldy joy. The last time I got to see them I felt the presence of Jesus strongly and the words they spoke to me were from Him. But when I was growing up as an adolescent, they never said anything to try to witness to me, because they thought I was a believer. However that didn’t matter because their love and joy and peace was all I needed to see. It clearly came from God.
Later a neighbor that I had who ended up becoming my spiritual grandmother, started inviting me over to her house. She treated me like her grandchild… gave me food and would talk with me like I was her own family. She started to tell me about Christ and how nothing in this world would fill the emptiness in my heart. Her love and genuine care, and also not judging me was her witness, in addition to telling me about the Lord. If she had not genuinely cared or loved me, telling me about Christ would not have been effective. The truth must be shared in love.
Later in life I have been hungry and poor because of being/living in third world countries in Latin America (mostly Colombia). I have prayed to God for what I needed, food basically. So God used Catholics to give me food without me even asking them. They also didn’t know I had prayed or that I was hungry. However he had also used one evangelical couple, a pastor and his wife, in another country, when I was in need. By the way, I do not aspire to be helped by others and I don’t think anyone wants to be in that position. However I have been able to see God’s power when I am so weak. So God has used all this to humble me and also so I can rely more on Him.
One of my friends is Catholic and she can’t even read (she is Colombian and middle aged and comes from a poor background, which is why she can’t read), but because of her grace and generosity (she also helps the poor with food), that was a witness to me. She also saved my husband’s life several months ago while I was in America. He nearly died from being sick, but my friend’s boyfriend came and got him, and brought him to their house, while she nursed him back to health.
My husband has Catholic friends but is still anti-Catholic and seems to ignore how much more caring they are than people from his own evangelical church in his hometown (in Colombia). Maybe I am being judgemental about them though?
The family who witnessed to me by their joy, and my spiritual grandmother, both in America, are Evangelicals. However the evangelical Charismatic Christians in Colombia anyway, seem far more concerned with the prosperity gospel, and getting materially blessed with more things, than helping others. I am generalizing here but this has been my experience and what I have seen.